XYTRONYX INC
10-Q, 1996-11-13
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>

                                       FORM 10-Q
                            SECURITIES AND EXCHANGE COMMISSION

                                  Washington D.C.  20549

                         QUARTERLY REPORT UNDER SECTION 13 OR 15(d)
                           OF THE SECURITIES EXCHANGE ACT OF 1934
                          FOR THE QUARTER ENDED SEPTEMBER 30, 1996
                                 COMISSION FILE NUMBER 1-9613

                                      Xytronyx, Inc.
                                 -------------------------
                   (Exact name of registrant as specified in its charter)


                        Delaware                           36-3258753
                -------------------------         -------------------------
                (State of incorporation)    (I.R.S. Employer Identification No.)

            6555 Nancy Ridge Drive, Suite 200, San Diego, CA          92121
           --------------------------------------------------    ---------------
              (Address of principal executive offices)              (Zip  Code)

                                       (619) 550-3900
                                 -------------------------
                      (Registrant's Telephone number, including area code)


Indicate by check mark whether the registrant (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 
1934 during the preceding 12 months (or for such shorter period that the 
registrant was required to file such reports) and (2) has been subject to 
such filing requirements for the past 90 days.   Yes X     No 
                                                    -----    -----

As of November 13, 1996, there were 8,132,279 shares of the registrant's 
Common Stock, $.02 par value outstanding.

<PAGE>

                             XYTRONYX, INC. AND SUBSIDIARIES
                             (A DEVELOPMENT STAGE ENTERPRISE)
                             INCORPORATED SEPTEMBER 23, 1983

                                         INDEX

Cautionary Statement Under the Private Securities 
Litigation Reform Act of 1995 . . . . . . . . . . . . . . . . . . . . . . . . 1

PART I - FINANCIAL INFORMATION

     Item 1.   Financial Statements

               Consolidated Statements of Operations -
               Three Months and Six Months Ended 
               September 30, 1996 and 1995 and from
               September 23, 1983 (Inception) to
               September 30, 1996 . . . . . . . . . . . . . . . . . . . . . . 2

               Consolidated Balance Sheets -
               September 30, 1996 and March 31, 1996  . . . . . . . . . . . . 3
     
              Consolidated Statements of Stockholders' Equity (Deficit) -
              Six Months Ended September 30, 1996 and 1995  . . . . . . . . . 4
     
              Consolidated Statements of Cash Flows -
              Six Months Ended September 30, 1996 and 1995
              and from September 23, 1983 (Inception) to
              September 30, 1996  . . . . . . . . . . . . . . . . . . . . . . 5
     
              Notes to Consolidated Financial Statements  . . . . . . . . . . 6


     Item 2.  Management's Discussion and Analysis of
              Financial Condition and Results of Operations . . . . . . . . . 9


PART II - OTHER INFORMATION

     Item 4.  Submission of Matters to a Vote of Security Holders . . . . . . 12

     Item 6.   Exhibits and Reports on Form 8-K . . . . . . . . . . . . . . . 12

SIGNATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12


<PAGE>

                   CAUTIONARY STATEMENT UNDER THE PRIVATE SECURITIES
                           LITIGATION REFORM ACT OF 1995

Statements in this Quarterly Report on Form 10-Q under the caption 
"Management's Discussion and Analysis of Financial Condition and Results of 
Operations" and in the "Notes to Consolidated Financial Statements", as well 
as oral statements that may be made by the Company or by officers, directors 
or employees of the Company acting on the Company's behalf, that are not 
historical fact constitute "forward-looking statements" within the meaning of 
Section 27A of the Securities Act of 1933, as amended, and Section 21E of the 
Securities Exchange Act of 1934, as amended.  These forward-looking 
statements involve risks and uncertainties, including, but not limited to, 
the risk that the Company may not be able to obtain additional financing; the 
risk that the Company may not be able to maintain its listing on the American 
Stock Exchange; and the risk that the Company may not be able to continue the 
necessary development of its operations on a profitable basis.  In addition, 
the Company's business, operations and financial condition are subject to 
reports and statements filed from time to time with the Securities and 
Exchange Commission, including the Company's annual report on Form 10-K, for 
the fiscal year ended March 31, 1996 and this Report

                                       1
<PAGE>

XYTRONYX, INC. AND SUBSIDIARIES (A Development Stage Enterprise)

CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited)

<TABLE>
<CAPTION>
                                           Three Months Ended        Six Months Ended
                                               September 30             September 30            September 23, 1983
                                      --------------------------   ----------------------         (inception) to
                                          1996          1995         1996        1995           September 30, 1996
- ----------------------------------------------------------------   -----------------------------------------------
<S>                                   <C>          <C>             <C>           <C>                <C>
REVENUES

   Product sales                      $   7,672    $    11,030     $   12,697    $   11,030         $1,862,443
   License fees and royalties                 -              -              -             -            480,000
   Contract research                     17,700          5,000         21,672        45,000            250,563
   Marketing rights                           -         30,000              -        30,000          1,306,500
   Interest and other                     5,726          4,170         21,561        54,878          1,532,358
- ----------------------------------------------------------------   --------------------------    -----------------
Total revenues                           31,098         50,200         55,930       140,908          5,431,864
- ----------------------------------------------------------------   --------------------------    -----------------

COSTS AND EXPENSES

   Cost of product sales                 11,398         29,397         21,168        60,414          2,923,903
   Product development                  567,933        444,053      1,289,421       701,723         13,688,285
   General and administrative           261,561        276,156        554,050       692,011         15,164,033
   Business development
     and marketing                       71,791        166,889        129,883       261,305          3,397,566
   Interest and other                    14,383         11,433         16,771        11,135            507,002

- ----------------------------------------------------------------   --------------------------    -----------------
Total costs and expenses                927,066        927,928      2,011,293     1,726,588         35,680,789
- ----------------------------------------------------------------   --------------------------    -----------------

Net loss                              ($895,968)     ($877,728)   ($1,955,363)  ($1,585,680)       ($30,248,925)
- ----------------------------------------------------------------   --------------------------    -----------------

Net loss per share
   of common stock                       ($0.11)        ($0.17)        ($0.24)       ($0.30)
- ----------------------------------------------------------------   -------------------------- 

Weighted average
   shares outstanding                 8,108,027      5,263,029      8,095,769     5,263,029
- ----------------------------------------------------------------   -------------------------- 

</TABLE>


See Notes to Consolidated Financial Statements.


                                       2

<PAGE>

XYTRONYX, INC. AND SUBSIDIARIES (A Development Stage Enterprise)

CONSOLIDATED BALANCE SHEETS (unaudited)

<TABLE>
<CAPTION>
                                                      September 30, 1996       March 31, 1996
- ---------------------------------------------------------------------------------------------
<S>                                                   <C>                      <C>
ASSETS
CURRENT ASSETS:    
Cash and cash equivalents                                       $194,182             $409,651
Short-term investments                                                 -            1,288,106
Accounts receivable, net of allowance                              2,695                2,668
Inventory                                                         35,320               40,907
Prepaid expenses                                                 241,853               95,945
- ---------------------------------------------------------------------------------------------
   Total current assets                                          474,050            1,837,277

Property and equipment, net of accumulated depreciation          115,221              135,234
Patent costs, net of accumulated amortization                    166,282              190,159
Other assets                                                      11,798               11,798
- ---------------------------------------------------------------------------------------------
TOTAL ASSETS                                                    $767,351           $2,174,468
- ---------------------------------------------------------------------------------------------

LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current Liabilities:
Accounts payable                                                $580,674             $214,310
Accrued expenses                                                 336,565              378,927
Note payable                                                     147,876                    -
Current portion of capitalized leases                              4,527               12,512
- ---------------------------------------------------------------------------------------------
   Total current liabilities                                   1,069,642              605,749

Other liabilities                                                 15,398               20,670

Stockholders' Equity (Deficit):
Preferred stock, $25 par value, 300,000 shares authorized              -                    -
Common stock, $.02 par value,  30,000,000 shares authorized;
   8,119,779 and 8,051,029 shares issued and outstanding at
   September 30 and March 31, 1996, respectively                 162,396              161,021
Capital in excess of par value                                29,768,840           29,680,590
Deficit accumulated during the development stage             (30,248,925)         (28,293,562)
- ---------------------------------------------------------------------------------------------
   Total stockholders' equity (deficit)                         (317,689)           1,548,049
- ---------------------------------------------------------------------------------------------
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)            $767,351           $2,174,468
- ---------------------------------------------------------------------------------------------

</TABLE>


See Notes to Consolidated Financial Statements.


                                       3

<PAGE>

XYTRONYX, INC. AND SUBSIDIARIES (A Development Stage Enterprise)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (unaudited)

<TABLE>
<CAPTION>                                                                                                    
                                                                                        Deficit  
                                             Common Stock                            Accumulated
                                       ------------------------         Capital       During the
                                                                       in Excess     Development
                                        Shares      Par Value         of Par Value       Stage            Total
- -------------------------------------------------------------------------------------------------------------------
<S>                                   <C>           <C>             <C>              <C>                <C>
Balance at March 31, 1995             5,263,029     $105,261        $26,816,207      ($25,037,659)      $1,883,809

Net loss                                                                               (1,585,680)      (1,585,880)
- -------------------------------------------------------------------------------------------------------------------
Balance at September 30, 1995         5,263,029     $105,261        $26,816,207      ($26,623,339)        $298,129
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------

Balance at March 31, 1996             8,051,029     $161,021        $29,680,590      ($28,293,562)      $1,548,049
Exercise of warrants                     68,750        1,376             63,250                             64,625
Issuance of warrant                                                      25,000                             25,000
Net  loss                                                                              (1,955,363)      (1,955,363)
- ------------------------------------------------------------------------------------------------------------------
Balance at September 30, 1996         8,119,779     $162,396        $29,768,840      ($30,248,925)       ($317,689)
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------

</TABLE>


See Notes to Consolidated Financial Statements.


                                       4
<PAGE>

XYTRONYX, INC. AND SUBSIDIARIES (A Development Stage Enterprise)

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

<TABLE>
<CAPTION>

                                                         Six Months Ended     
                                                           September 30,         September 23, 1983
                                                    --------------------------      (inception) to
                                                      1996             1995      September 30, 1996
- ------------------------------------------------------------------------------  ---------------------
<S>                                                 <C>          <C>                <C>
OPERATING ACTIVITIES                                
Net loss                                            ($1,955,363) ($1,585,680)       ($30,248,925)
Adjustments to reconcile net loss to net cash
used by operating activities:
 Depreciation and amortization                           55,620        60,998          1,529,633
 Non-cash expense upon issuance of common stock
  options, common stock and warrants                     25,000             -            500,296
 Net book value of disposals                                  -         5,507            148,252
 Option income from retirement of stock
  or amounts previously advanced by customer                  -             -           (400,000)
 Changes in assets and liabilities:
  Accounts receivable                                       (27)        4,411             (2,696)
  Inventory                                               5,587           621            (35,323)
  Prepaid expenses and other assets                    (145,908)     (262,079)          (252,828)
  Accounts payable                                      366,364        27,948            580,673
  Accrued expenses                                      (42,362)      116,489            192,542
  Customer advances                                           -       (30,888)           140,863
  Other liabilities                                      (2,976)       (5,948)                 -
- ------------------------------------------------------------------------------  ---------------------
 Net cash used by operating activities               (1,694,065)   (1,668,621)        (27,847,513)

INVESTING ACTIVITIES
Purchases of short-term investments                           -             -          (5,480,432)
Maturities of short-term investments                  1,288,106       992,326           5,480,432
Capital expenditures                                     (3,865)      (35,062)           (825,528)
Patent costs                                             (7,865)      (20,104)           (888,493)
Other                                                         -             -                (996)
- ------------------------------------------------------------------------------  ---------------------
 Net cash provided (used) by investing activities     1,276,376       937,160          (1,715,017)

FINANCING ACTIVITIES
Issuance of notes payable                               218,966       349,606           1,878,367
Repayment of notes payable                              (71,090)     (106,481)         (1,511,747)
Repayment of capitalized lease obligations              (10,281)      (19,926)           (185,263)
Long-term customer advances                                   -             -             100,000
Issuance of common and preferred stock                   64,625             -          29,412,855
Issuance of stock warrants                                    -             -              62,500
- ------------------------------------------------------------------------------  ---------------------
 Net cash provided by financing activities              202,220       223,199          29,756,712
- ------------------------------------------------------------------------------  ---------------------
Net increase (decrease) in cash
 and cash equivalents                                  (215,469)     (508,262)            194,182
Cash and cash equivalents at beginning of period        409,651       827,752                  -
- ------------------------------------------------------------------------------  ---------------------
Cash and cash equivalents at end of period             $194,182      $319,490           $194,182
- ------------------------------------------------------------------------------  ---------------------

</TABLE>


See Notes to Consolidated Financial Statements.


                                       5

<PAGE>

                               XYTRONYX, INC. AND SUBSIDIARIES
                               (A DEVELOPMENT STAGE ENTERPRISE)

                      NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1.  PRINCIPLES OF INTERIM PERIOD REPORTING

The consolidated financial statements include the accounts of Xytronyx, Inc. 
and its wholly owned subsidiaries, Perio Test, Inc. and XYX Acquisition Corp. 
(collectively the "Company").  All significant intercompany balances and 
transactions have been eliminated.

The Company has not earned significant revenues from planned principal 
operations.  Accordingly, the Company's activities have been accounted for as 
those of a "Development Stage Enterprise" as set forth in Financial 
Accounting Standards Board Statement No. 7 ("FAS 7"). Among the disclosures 
required by FAS 7 are that the Company's financial statements be identified 
as those of a development stage enterprise, and that certain consolidated 
financial statements disclose activity since the date of the Company's 
inception.

The accompanying financial statements have been prepared on a going concern 
basis, which contemplates the realization of assets and the satisfaction of 
liabilities in the normal course of business.  The financial statements do 
not include any adjustments relating to the recoverability and classification 
of recorded asset amounts or the amount and classification of liabilities 
that might be necessary should the Company be unable to continue as a going 
concern. The Company's continuation as a going concern is dependent upon its 
ability to generate sufficient cash flow to meet its obligations on a timely 
basis, to comply with the terms and covenants of its financing agreements and 
business contracts, to obtain additional financing or refinancing as may be 
required, and ultimately to attain successful operations.  Management 
anticipates that without significant revenues its currently available 
resources will allow planned operations to continue through December 1996, 
and possibly beyond that date. Unanticipated expenses, however, could shorten 
that period.  Accordingly, the Company will require additional financing from 
time-to-time until it begins to generate positive cash flow from operations.  
There can be no assurance that the Company will be successful in obtaining 
financing, or that it will attain positive cash flow from operations.

The preparation of financial statements in conformity with generally accepted 
accounting principles requires management to make estimates and assumptions 
that affect the reported amount of assets and liabilities and disclosure of 
contingent assets and liabilities at the date of the financial statements and 
the reported amounts of revenues and expenses during the period.  Actual 
results may differ from those estimates.

In the opinion of the Company, the unaudited consolidated financial 
statements contain all of the adjustments, consisting only of normal 
recurring adjustments and accruals, necessary to present fairly the financial 
position of the Company as of September 30, 1996 and March 31, 1996, and the 
results of operations for the three months and six months ended September 30, 
1996 and 1995 and from September 23, 1983 (inception) to September 30, 1996.  
The results of operations for the three months and six months ended September 
30, 1996 are not necessarily indicative of the results to be expected in 
subsequent periods or for the year as a whole.  For further information, 
refer to the consolidated financial statements and footnotes thereto as set 
forth in the Company's annual report on Form 10-K for the year ended March 
31, 1996.

                                       6
<PAGE>

2.  OPTION TO ACQUIRE BINARY THERAPEUTICS, INC.

On June 4, 1996 the Company entered into an agreement with Binary 
Therapeutics, Inc. ("BTI") under which the Company was granted an option to 
acquire BTI, a development stage company with certain technologies in the 
area of Photodynamic Therapy ("PDT") for cancer.  The agreement gives the 
Company the right to acquire BTI at anytime prior to April 30, 1997 by a 
merger of BTI into a wholly owned subsidiary of the Company.  If the Company 
elects to exercise its option, the agreement calls for the Company to issue 
common stock to the BTI stockholders with an aggregate acquisition value of 
$6,000,000. The number of shares of the Company's common stock to be issued 
will be determined based upon the market value of the Company's common stock 
prior to the date of exercise, although the value of the common stock cannot 
be less than $2.00 or more than $6.00 per share. 

Under the agreement, the Company will assist BTI during the option period in 
preparing one or more PDT products for advancement into human clinical 
trials. In order to exercise its rights to consummate the merger the Company 
will have to satisfy certain conditions, including funding up to $1,250,000 
in expenses budgeted to be incurred by BTI during the option period.  These 
expenses represent the majority of BTI's budgeted expenditures for the period 
and are expected to be comprised primarily of product development costs.  The 
Company is also required to advance to BTI funds to repay $285,000 in 
indebtedness in the event that the Company completes an equity financing with 
net proceeds of $2,500,000 or more, and to advance to BTI funds to repay an 
additional $243,000 in indebtedness in the event the Company completes an 
equity financing with net proceeds of $5,000,000 or more.  Certain holders of 
such indebtedness are shareholders of the Company.  In exchange for such 
funding BTI will issue convertible notes to the Company which may be 
converted into BTI equity at the Company's option.  The Company has elected 
to record all advances to BTI as product development expense in the period 
incurred due to uncertainties regarding the ultimate value to be realized 
from the convertible notes.  During the quarter ended September 30, 1996 and 
for the six month period then ended, the Company advanced $228,000 and 
$429,000 respectively, to BTI and such advances are included in product 
development expense.  In the event that the Company terminates the agreement, 
the Company would remain obligated to continue funding of such product 
development expenses incurred during the period ending 90 days from such 
termination. 

The agreement has been approved by a majority of the stockholders of BTI.  
The Company's Common Stock is listed for quotation on AMEX, which requires 
shareholder approval of the issuance of additional  shares of Common Stock or 
securities convertible into Common Stock if the issuance of such securities 
(i) is in connection with the acquisition of a company and the shares of 
Common Stock or securities convertible into Common Stock could result in an 
increase in the number of outstanding shares of Common Stock of 20% or more, 
(ii) is in connection with the acquisition of a company where a director, 
officer or substantial shareholder of the Company has a 5% or greater 
interest in such company and the issuance of the securities could result in 
an increase in outstanding Common Stock of 5% or more.  Even if the Company 
is not required to obtain such approval, the Company may elect to obtain the 
approval of its stockholders prior to effecting the merger with BTI.

                                       7

<PAGE>

3.  LICENSE AGREEMENT WITH WOUND HEALING OF OKLAHOMA

On May 8, 1996 the Company entered into an agreement with Wound Healing of 
Oklahoma ("WHO"), a privately held corporation, under which the Company 
acquired an exclusive world-wide license to a certain technology, 
Photodynamic Immunotherapy-TM- ("PDIT-TM-") treatment for cancer.  Under the 
agreement the Company granted WHO a ten-year warrant to purchase 100,000 
shares of the Company's common stock at an exercise price of $2.25 per share 
and must pay a minimum royalty of $50,000 per year.  Based upon the 
negotiated terms of the agreement, the warrants were valued at $50,000.  
During the six months ended September 30, 1996 the Company recorded $50,000 
in product development expense related to the agreement which included a 
$25,000 royalty payment and $25,000 related to the issuance of the warrant.   

4.  NOTE PAYABLE

The note payable is an insurance premium finance agreement with principal and
interest, at an annual rate of 10.50%, payable in monthly installments of
$25,406, due in full on March 15, 1997. 

5.  LINE OF CREDIT

On September 30, 1996 the Company entered into a line of credit agreement 
with two shareholders under which the Company may borrow up to $500,000.  The 
agreement calls for interest at the rate of 12% per annum.  Principal and 
accrued interest are due and payable upon the earlier of (a) the initial 
closing of a financing arrangement, or; (b) December 31, 1996. On October 7, 
1996, the Company drew down $200,000 on the available line.

In connection with the line of credit agreement discussed above, the Company 
granted the two shareholders five-year warrants to purchase 150,000 shares of 
the Company's common stock at an exercise price to be determined in 
connection with the closing of the private placement discussed in Note 6.

6.  SUBSEQUENT EVENT-STOCKHOLDERS' EQUITY

In October 1996, the Company initiated a private placement pursuant to 
Regulation D under the Securities Act of 1933, as amended (the "Securities 
Act"), of the Company's equity securities to certain Accredited Investors as 
defined by the Securities Act.  In connection with the private placement, the 
Company has engaged a placement agent, to whom it will pay customary fees and 
expenses in connection with the placement.  The fully subscribed placement, 
including the over-allotment, could result in aggregate net proceeds of up to 
approximately $5,175,000 to the Company, after total expenses of 
approximately $825,000.  The securities to be offered will not have been 
registered under the Securities Act at the time of the private placement and 
may not be offered or sold in the United States without registration or an 
applicable exemption from registration requirements.  In accordance with the 
terms of the placement, the Company has agreed to file a registration 
statement with respect to the resale of certain of the securities to be 
offered.

                                       8

<PAGE>

                         XYTRONYX, INC. AND SUBSIDIARIES
                         (A DEVELOPMENT STAGE ENTERPRISE)
                         INCORPORATED SEPTEMBER 23, 1983

                       MANAGEMENT'S DISCUSSION AND ANALYSIS
                 OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

RESULTS OF OPERATIONS

Total revenues aggregated $31,000 for the quarter ended September 30, 1996, a 
$19,000, or 38%, decrease from revenues of $50,000 recorded during the same 
period of the prior year. Current quarter revenues relate to product sales 
and contract research for the use of the Company's Kephra-TM- reversible 
color change technology in various applications. Cost of product sales 
decreased $18,000, or 61%, from the prior year.  This decrease is consistent 
with the decrease in product sales.

Total revenues for the six month period ending September 30, 1996, totaled 
$56,000, a decrease of $85,000, or 60%, from the same period of the prior 
year. Prior year revenues for this six month period included approximately 
$30,000 in income related to the termination of a marketing agreement.  No 
such revenues were earned in the current quarter.  Cost of product sales for 
the six month period ending September 30, 1996 decreased $39,000, or 65%, for 
the prior year, consistent with the decrease in product sales.

Product development costs totaled $568,000 for the quarter, an increase of 
$124,000 or 30%  over the prior year costs of $444,000.  The majority of the 
increase resulted from the initiation of work on two projects in the cancer 
therapy area, including:  (i) $228,000 in funding of product development 
expenses in accordance with the Agreement and Plan of Merger with Binary 
Therapeutics, Inc. ("BTI"), the holder of certain technologies in the area of 
Photodynamic Therapy ("PDT") for the treatment of cancer, and (ii) $94,000 in 
expenses related to the acquisition of the Photodynamic 
Immunotherapy-TM-("PDIT-TM-") technology for the treatment of cancer, 
expenses incurred in association with a related research agreement and 
expenses incurred related to in-house product development of the PDIT-TM- 
technology.  No such costs were incurred in the prior year. 

For the six months ended September 30, 1996, product development costs 
increased $588,000, or 84%, over the same period of the prior year to 
$1,289,000. The initiation of work on the two projects discussed above 
generated expenses of $774,000 for the six month period.  No such costs were 
incurred in the same period of the prior year.  This increase was offset by a 
$175,000 reduction in expenditures for the six month period related to the 
completion of the U.S. FDA clinical trials for the Periodontal Tissue Monitor 
("PTM"). 

Business development costs for the current quarter totaled $72,000, a decrease
of $95,000, or 57%, from the same quarter of the prior year.  General and
administrative expenses for the three month period ended September 30, 1996
decreased 5%  to $262,000 from the same period of the prior year. The decreases
are a result of managment concentrating its efforts in the product development
area related to PDT and PDIT discussed above which resulted in a greater
proportion of expenses charged to product development.

                                       9
<PAGE>

Management's Discussion and Analysis of Financial Condition and Results of 
Operations

Business development costs for the six month period ended September 30, 1996 
decreased  $131,000, or 50%, from the same period of the prior year to 
130,000. General and administrative expenses for the six month period ended 
September 30, 1996 decreased $138,000, or 20%, from the same period of the 
prior year to $554,000.  As discussed above, this decrease is due to 
managment concentrating its efforts in the product development area related 
to the two new technologies, resulting in a greater proportion of expenses 
charged to product development.

Net loss for the quarter ended September 30, 1996 totaled $896,000, a 2% 
increase over the prior year's second quarter loss of $878,000.  This 
increase is a result of the increase in product development efforts discussed 
above offset by reductions in cost of product sales, business development and 
general and administrative expenses. Net loss per share of common stock for 
the quarter ended September 30, 1996 was $.11, a 35% decrease from the prior 
year's second quarter loss of $.17 per share due to a 2,845,000 increase in 
the weighted average number of shares outstanding. 

Net loss for the six months ended September 30, 1996 totaled $1,955,000, an 
increase of $370,000, or 23%, over the same period of the prior year.  This 
increase is a result of the increase in product development efforts offset by 
a reduction in certain expenditures.  Net loss per share of common stock for 
the six months ended September 30, 1996 was $.24, a 20% decrease from the 
loss of $.30 per share for the same period of the prior year.  The decrease 
is a result of a 2,833,000 increase in the weighted average number of shares 
outstanding for the six month period.

CAPITAL RESOURCES AND LIQUIDITY

Cash, cash equivalents and short-term investments at September 30, 1996 
totaled $194,000, a $1,504,000, or 89%, decrease from the March 31, 1996 
balance. Working capital at September 30, 1996 decreased by 148% from March 
31, 1996 to a negative balance of $596,000.  These decreases were primarily 
due to the net loss for the six month period ending September 30, 1996 and 
other less significant changes in certain balance sheet accounts since March 
31, 1996. Prepaid expenses increased by $146,000 as a result of the 
prepayment of annual insurance premiums.  Notes payable increased by 
approximately $148,000 as a result of financing these insurance premiums. 
Accounts payable and accrued expenses increased a net $324,000 for the 
six-month period.  Stockholders equity decreased by $1,866,000 primarily as a 
result of the net loss for the period.

Since inception, the Company has experienced negative cash flow from 
operations, and the Company considers it prudent to anticipate that negative 
cash flow from operations will continue for the foreseeable future, and that 
outside sources of funding will continue to be required.  On September 30, 
1996 the Company entered into a line of credit agreement with two 
shareholders under which the Company may borrow up to $500,000 and in 
October, it commenced the private placement described in Note 6 of the Notes 
to Consolidated Financial Statements.  The Company expects this credit 
agreement will meet cash requirements until the initial closing of the 
private placement.  Without significant future revenues, but including the 
borrowing under the line of credit, the Company's financial resources are 
anticipated to be adequate through December 1996, based on a continuation of 
the pattern of expenses which have prevailed during Fiscal 1997. 
Unanticipated expenses or working capital requirements could, however, 
shorten that period.

                                       10

<PAGE>

Management's Discussion and Analysis of Financial Condition and Results of 
Operations

In March 1996 the Company completed a 12-month U.S. clinical trial of PTM at 
three universities. The Company has compiled and analyzed the data generated 
from the clinical studies.  In September 1996 the Company submitted a 
Premarket Approval application ("PMA") to the Food and Drug Administration 
("FDA") and is currently awaiting a response from the FDA.  The completion of 
the clinical studies have resulted in the reduction or elimination of certain 
product development expenses.

In May 1996 the Company entered into an agreement with Hawe-Neos Dental to 
distribute the PTM in Europe.  In September 1996, the Company received the 
initial purchase order for $75,000 associated with the European launch of the 
PTM from Hawe Neos.  The order is expected to be delivered in the third 
quarter of Fiscal 1997.  In January 1995 the Company entered into an 
agreement with Shofu Dental Company for distribution of the PTM in Japan.  
Shofu is currently conducting Japanese clinical trials of the PTM.  The 
Company is in the process of identifying marketing partners for the PTM for 
the U.S. and other markets. In the event the Company begins selling material 
quantities of the PTM, the Company may need additional working capital, and 
additional personnel and space, both of which may cause an increase in the 
net utilization of cash.  However, there can be no assurance that FDA PMA 
approval or any other required regulatory approvals will be forthcoming, that 
the Company will complete any new marketing agreements, or that any of its 
existing or future marketing partners will order the PTM products in 
increased quantities.

In May 1996 the Company entered into an agreement with Wound Healing of 
Oklahoma ("WHO"), a privately held corporation, under which it acquired an 
exclusive license to certain proprietary technology in the PDIT treatment of 
cancer.  The Company expects to fund certain product development efforts 
associated with the commercialization of the licensed technology, including 
the commencement of human clinical trials, which will increase the Company's 
net utilization of cash.  However, there can be no assurance that FDA and 
other regulatory approval required to commence such trials will be 
forthcoming.

In June 1996 the Company entered into an agreement which granted the Company 
the option to acquire Binary Therapeutics, Inc. ("BTI").  BTI is a privately 
held, development stage enterprise holding certain technologies for the PDT 
treatment of cancer.  Under the agreement the Company expects to fund certain 
product development expenses incurred by BTI, which will increase the 
Company's net utilization of cash.

The Company continues to be engaged in efforts to obtain additional financing 
and to seek strategic partners to aid in the development and marketing of its 
products.  The continued existence of the Company is dependent upon receiving 
additional financing from time-to-time until it begins to generate positive 
cash flow from operations.  If and as orders for the Company's products are 
placed in increasing quantities, the Company expects to seek equity and/or 
debt financing as a function of availability and cost.  No assurance can be 
given that the Company will be successful in obtaining additional equity 
and/or debt financing or locating new strategic partners, or that it will be 
able to generate positive cash flow from operations.

                                       11

<PAGE>

PART II-OTHER INFORMATION

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

At the Annual Meeting of Stockholders on August 9, 1996, the following 
matters were voted on and approved:

1.   Eight Directors were elected to the Board of Directors to hold office for a
     one-year term or until their successors are elected and qualified.  The
     following persons were elected:  Mr. Larry O. Bymaster, Mr. H. Lawrence
     Garrett, III, Mr. Jack H. Halperin, Mr. William L. Jorgenson, Mr. John M.
     Kolbas, Mr. Elliott H. Vernon, Mr. Morris S. Weeden and Mr. Michael S.
     Weiss.  5,746,750 shares of Common Stock, or 96.7% of the shares voting,
     voted in favor of all the nominees for Director listed in the Proxy
     Statement.  There were no votes against any Director and 198,945, or 3.3%
     of the shares voting, abstained.

2.   The Boards selection of Deloitte & Touche LLP as the Company's
     independent public accountants for the fiscal year ended March 31, 1997 was
     ratified.  5,787,740 shares of Common Stock, or 97.3% of the shares voting,
     voted in favor of the proposal.  82,738 shares, or 1.4% of the voting
     shares, voted against the proposal, and 75,217 shares, or 1.3% of the
     voting shares, abstained.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

a)   EXHIBITS

Exhibit Number           Description of Exhibit   
- --------------           ----------------------

    4.5                  Warrant Agreement for "Class B Warrants"

b)  REPORTS ON FORM 8-K

Date of Report     Item Reported     Financial Statements Filed
- --------------     -------------     --------------------------
None                   None                    No   

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                            Xytronyx, Inc.

Date:  November 13, 1996    /s/  Corrine D. Gulutz       
                            ----------------------
                            Corrine D. Gulutz
                            Chief Accounting Officer 
                            (Principal Accounting Officer and Officer
                            duly authorized to sign this report on 
                            behalf of the registrant)                      

                                       12

<PAGE>


                                       INDEX TO EXHIBITS

Exhibit Number        Description of Exhibit
- --------------        ----------------------

     4.5              Warrant Agreement for "Class B Warrants"





<PAGE>


                                WARRANT AGREEMENT
                             FOR "CLASS B WARRANTS"

          AGREEMENT (this "Agreement") dated as of August 9, 1996, by and 
between XYTRONYX, INC., a Delaware corporation (the "Company") and AMERICAN 
STOCK TRANSFER & TRUST COMPANY, as warrant agent (the "Warrant Agent").

                               W I T N E S S E T H

          WHEREAS, in connection with the settlement of a class action 
lawsuit (the "Settlement") the Company will issue 309,734 Class B Warrants 
("Warrants"), each Warrant exercisable to purchase one share of common stock, 
par value $.02 per share of the Company ("Common Stock"); and 

          WHEREAS, the Company desires the Warrant Agent to act on behalf of 
the Company, and the Warrant Agent is willing to so act, in connection with 
the issuance, registration, transfer, exchange and redemption of the 
Warrants, the issuance of certificates representing the Warrants, the 
exercise of the Warrants, and the rights of the holders thereof;

          NOW THEREFORE, in consideration of the premises and the mutual 
agreements hereinafter set forth and for the purpose of defining the terms 
and provisions of the Warrants and the certificates representing the Warrants 
and the respective rights and obligations thereunder of the Company, the 
holders of certificates representing the Warrants and the Warrant Agent, the 
parties hereto agree as follows:

          SECTION 1.     DEFINITIONS.  As used herein, the following terms 
shall have the following meanings:

          (a)  "Common Stock" shall mean stock of the Company of any class, 
whether now or hereafter authorized, which has the right to participate in 
the distributions of earnings and assets of the Company without limit as to 
amount or percentage, which at the date hereof consists of 30,000,000 
authorized shares of Common Stock.

          (b)  "Corporate Office" shall mean the office of the Warrant Agent 
(or its successor) at which at any particular time its principal business 
shall be administered, which office is located at the date hereof at 40 Wall 
Street, New York, NY 10005.

          (c)  "Exercise Date" shall mean, as to any Warrant, the date on 
which the Warrant Agent shall have received both (a) the Warrant Certificate 
representing such Warrant, with the exercise form thereon duly executed by 
the Registered Holder thereof or his attorney duly authorized in writing, and 
(b) payment in cash, or by official bank or certified check made payable to 
the Company, of an amount in lawful money of the United States of America 
equal to the applicable Purchase Price.

          (d)  "Purchase Price" shall mean the purchase price to be paid upon 
exercise of each Warrant in accordance with the terms hereof, which price 
shall be $22.00 per share subject to adjustment from time to time pursuant to 
the provisions of Section 8 hereof, and subject to the Company's right to 
reduce the Purchase Price upon notice to all warrantholders.

                                       1

<PAGE>

          (e)  "Registered Holder" shall mean the person in whose name any 
certificate representing Warrants shall be registered on the books maintained 
by the Warrant Agent pursuant to Section 6.

          (f)  "Transfer Agent" shall mean American Stock Transfer & Trust 
Company, as the Company's transfer agent, or its authorized successor, as 
such.

          (g)  "Warrant Expiration Date" shall mean 5:00 P.M. (New York time) 
on August 11, 2001; provided that if such date shall in the State of New York 
be a holiday or a day on which banks are authorized to close, then 5:00 P.M. 
(New York time) on the next following day which in the State of New York is 
not a holiday or a day on which banks are authorized to close.  Upon notice 
to all warrantholders the Company shall have the right to extend the Warrant 
Expiration Date.

SECTION 2.     WARRANTS AND ISSUANCE OF WARRANT CERTIFICATES.

          (a)  A Warrant shall initially entitle the Registered Holder of the 
Warrant Certificate representing such Warrant to purchase one share of Common 
Stock upon the exercise thereof, in accordance with the terms hereof, subject 
to modification and adjustment as provided in Section 8.

          (b)  From time to time, up to the Warrant Expiration Date, the 
Transfer Agent shall execute and deliver stock certificates in required whole 
number denominations representing up to an aggregate of 309,734 shares of 
Common Stock, subject to adjustment as described herein, upon the exercise of 
Warrants in accordance with this Agreement.

          (c)  From time to time, up to the Warrant Expiration Date, the 
Warrant Agent shall execute and deliver Warrant Certificates in required 
whole number denominations to the persons entitled thereto in connection with 
any transfer or exchange permitted under this Agreement; provided that no 
Warrant Certificates shall be issued except (i) those initially issued 
hereunder, (ii) those issued upon the exercise of fewer than all Warrants 
represented by any Warrant Certificate, to evidence any unexercised Warrants 
held by the exercising Registered Holder, (iii) those issued upon any 
transfer or exchange pursuant to Section 6; (iv) those issued in replacement 
of lost, stolen, destroyed or mutilated Warrant Certificates pursuant to 
Section 7; and (v) at the option of the Company, in such form as may be 
approved by the its Board of Directors, to reflect (a) any adjustment or 
change in the Purchase Price or the number of shares of Common Stock 
purchasable upon exercise of the Warrants, made pursuant to Section 8 hereof 
and (b) other modifications approved by Warrantholders in accordance with 
Section 16 hereof.

          SECTION 3. FORM AND EXECUTION OF WARRANT CERTIFICATES.  (a)  
The Warrant Certificates shall be substantially in the form annexed hereto as 
Exhibit A (the provisions of which are hereby incorporated herein) and may 
have such letters, numbers or other marks of identification or designation 
and such legends, summaries or endorsements printed, lithographed, engraved 
or typed thereon as the Company may deem appropriate and as are not 
inconsistent with the provisions of this Agreement, or as may be required to 
comply with any law or with any rule or regulation made pursuant thereto or 
with any rule or regulation of any stock exchange on which the Warrants may 
be listed, or to conform to usage.  The Warrant Certificates shall be

                                       2

<PAGE>

dated the date of issuance thereof (whether upon initial issuance, transfer, 
exchange or in lieu of mutilated, lost, stolen, or destroyed Warrant 
Certificates) and issued in registered form. Warrants shall be numbered 
serially with the letters "WB."

          (b)  Warrant Certificates shall be executed on behalf of the 
Company by its Chairman of the Board, President or any Vice President and by 
its Secretary or an Assistant Secretary, by manual signatures or by facsimile 
signatures printed thereon, and shall have imprinted thereon a facsimile of 
the Company's seal.  In case any officer of the Company who shall have signed 
any of the Warrant Certificates shall cease to be such officer of the Company 
before the date of issuance of the Warrant Certificates and issue and 
delivery thereof, such Warrant Certificates may nevertheless be issued and 
delivered with the same force and effect as though the person who signed such 
Warrant Certificates had not ceased to be such officer of the Company.  After 
execution by the Company, Warrant Certificates shall be delivered by the 
Warrant Agent to the Registered Holder.

          SECTION 4.     EXERCISE.  Each Warrant may be exercised by the 
Registered Holder thereof at any time prior to the Warrant Expiration Date 
upon the terms and subject to the conditions, including without limitation, 
compliance with applicable securities laws, set forth herein and in the 
applicable Warrant Certificate.  A Warrant shall be deemed to have been 
exercised immediately prior to the close of business on the Exercise Date and 
the person entitled to receive the securities deliverable upon such exercise 
shall be treated for all purposes as the holder upon exercise thereof as of 
the close of business on the Exercise Date.  As soon as practicable on or 
after the Exercise Date, the Warrant Agent shall deposit the proceeds 
received from the exercise of a Warrant, and promptly after clearance of 
checks received in payment of the Purchase Price pursuant to such Warrants, 
cause to be issued and delivered by the Transfer Agent, to the person or 
persons entitled to receive the same, a certificate or certificates for the 
securities deliverable upon such exercise, (plus a certificate for any 
remaining unexercised Warrants of the Registered Holder).  Notwithstanding 
the foregoing, in the case of payment made in the form of a check drawn on an 
account of such investment banks and brokerage houses as the Company shall 
approve, certificates shall immediately be issued without any delay.  Upon 
the exercise of any Warrant and clearance of the funds received, the Warrant 
Agent shall promptly remit the payment received for the Warrant to the 
Company or as the Company may direct in writing.

          SECTION 5.     RESERVATION OF SHARES; LISTING; PAYMENT OF TAXES; ETC.
(a)  The Company covenants that it will at all times reserve and keep 
available out of its authorized Common Stock, solely for the purpose of issue 
upon exercise of Warrants, such number of shares of Common Stock as shall 
then be issuable upon the exercise of all outstanding Warrants. The Company 
covenants that all shares of Common Stock which shall be issuable upon 
exercise of the Warrants and payment of the Purchase Price shall, at the time 
of delivery, be duly and validly issued, fully paid, nonassessable and free 
from all taxes, liens and charges with respect to the issue thereof (other 
than those that arise as a result of the action or inaction of the Registered 
Holder).

          (b)  The Company will use reasonable efforts to obtain appropriate 
approvals or registrations under state "blue sky" securities laws with 
respect to the exercise of the Warrants; provided, however, that the Company 
shall not be obligated to file any general consent to service of process or 
qualify as a foreign corporation in any jurisdiction.  With respect to any 

                                       3

<PAGE>

such securities laws, however, Warrants may not be exercised by, or shares of 
Common Stock issued to, any Registered Holder in any state in which such 
exercise would be unlawful.

          (c)  The Company shall pay all documentary, stamp or similar taxes 
and other governmental charges that may be imposed with respect to the 
issuance of Warrants, or the issuance, or delivery of any shares upon 
exercise of the Warrants; provided, however, that if the shares of Common 
Stock are to be delivered in a name other than the name of the Registered 
Holder of the Warrant Certificate representing any Warrant being exercised, 
then no such delivery shall be made unless the person requesting the same has 
paid to the Warrant Agent the amount of transfer taxes or charges incident 
thereto, if any.

          (d)  The Warrant Agent is hereby irrevocably authorized to 
requisition the Company's Transfer Agent from time to time for certificates 
representing shares of Common Stock required upon exercise of the Warrants, 
and the Company will authorize the Transfer Agent to comply with all such 
proper requisitions.

          SECTION 6.     EXCHANGE AND REGISTRATION OF TRANSFER. 

          Subject to the restrictions on transfer contained in the Warrant 
Certificates and the Subscription Agreements between the Company and the 
purchasers of Units:

          (a)  Warrant Certificates may be exchanged for other Warrant 
Certificates representing an equal aggregate number of Warrants of the same 
class or may be transferred in whole or in part; provided that no transfers, 
sales or other dispositions of the Warrants may be made except after the time 
periods and in the percentages set forth in Section 1.9 of the Subscription 
Agreements.  Warrant Certificates to be exchanged shall be surrendered to the 
Warrant Agent at its Corporate Office, and upon satisfaction of the terms and 
provisions hereof, the Company shall execute, and the Warrant Agent shall 
countersign, issue and deliver in exchange therefor the Warrant Certificate 
or Certificates which the Registered Holder making the exchange shall be 
entitled to receive.

          (b)  The Warrant Agent shall keep at its office books in which, 
subject to such reasonable regulations as it may prescribe, it shall register 
Warrant Certificates and the transfer thereof in accordance with its regular 
practice.  Upon due presentment for registration of transfer of any Warrant 
Certificate at its office, the Company shall execute and the Warrant Agent 
shall issue and deliver to the transferee or transferees a new Warrant 
Certificate or Certificates representing an equal aggregate number of 
Warrants.

          (c)  With respect to all Warrant Certificates presented for 
registration of transfer, or for exchange or exercise, the subscription form 
on the reverse thereof shall be duly endorsed, or be accompanied by a written 
instrument or instruments of transfer and subscription, in form satisfactory 
to the Company, duly executed by the Registered Holder or his 
attorney-in-fact duly authorized in writing.

          (d)  The Company may require payment by such holder of a sum 
sufficient to cover any tax or other governmental charge that may be imposed 
in connection therewith.


                                       4

<PAGE>

          (e)  All Warrant Certificates surrendered for exercise or for 
exchange in case of mutilated Warrant Certificates shall be promptly canceled 
by the Warrant Agent and thereafter retained by the Warrant Agent until 
termination of this Agreement or resignation of the Warrant Agent, or, with 
the prior written consent of Paramount, disposed of or destroyed, at the 
direction of the Company.

          (f)  Prior to due presentment for registration of transfer thereof, 
the Company and the Warrant Agent may deem and treat the Registered Holder of 
any Warrant Certificate as the absolute owner thereof and of each Warrant 
represented thereby (notwithstanding any notations of ownership or writing 
thereon made by anyone other than a duly authorized officer of the Company or 
the Warrant Agent) for all purposes and shall not be affected by any notice 
to the contrary.

          SECTION 7.     LOSS OR MUTILATION.  Upon receipt by the Company and 
the Warrant Agent of evidence satisfactory to them of the ownership of and 
loss, theft, destruction or mutilation of any Warrant Certificate and (in 
case of loss, theft or destruction) of indemnity satisfactory to them, and 
(in the case of mutilation) upon surrender and cancellation thereof, the 
Company shall execute and the Warrant Agent shall (in the absence of notice 
to the Company and/or Warrant Agent that the Warrant Certificate has been 
acquired by a bonafide purchaser) countersign and deliver to the Registered 
Holder in lieu thereof a new Warrant Certificate of like tenor representing 
an equal aggregate number of Warrants.  Applicants for a substitute Warrant 
Certificate shall comply with such other reasonable regulations and pay such 
other reasonable charges as the Warrant Agent may prescribe.

          SECTION 8.     ADJUSTMENT OF PURCHASE PRICE AND NUMBER OF SHARES OF 
COMMON STOCK OR WARRANTS.  The Purchase Price in effect at any time and the 
number and kind of securities purchasable upon the exercise of the Warrants 
shall be subject to adjustment from time to time upon the happening of 
certain events as follows:

          (a)  In case the Company shall (i) declare a dividend or make a 
distribution on its outstanding shares of Common Stock in shares of Common 
Stock, (ii) subdivide or reclassify its outstanding shares of Common Stock 
into a greater number of shares, or (iii) combine or reclassify its 
outstanding shares of Common Stock into a smaller number of shares, the 
Exercise  Price in effect at the time of the record date for such dividend or 
distribution or the effective date of such subdivision, combination or 
reclassification shall be adjusted so that it shall equal the price 
determined by multiplying the Purchase Price by a fraction, the denominator 
of which shall  be the number of shares of Common Stock outstanding after 
giving effect to such action, and the numerator of which shall be the number 
of shares of Common Stock outstanding immediately prior to such action.  Such 
adjustment shall be successively whenever any event listed above shall occur.

          (b)  Whenever the Purchase Price payable upon exercise of each 
Warrant is adjusted pursuant to Subsection (a) above, the number of Shares 
purchasable upon exercise of this Warrant shall simultaneously be adjusted by 
multiplying the number of Shares initially issuable upon exercise of this 
Warrant by the Purchase Price in effect on the date hereof and dividing the 
product so obtained by the Purchase Price, as adjusted.

                                       5

<PAGE>

          (c)  No adjustment in the Purchase Price shall be required unless 
such adjustment would require an increase or decrease of at least five cents 
(0.05) in such price; provided, however, that any adjustments which by reason 
of this Subsection (c) are not required to be made shall be carried forward 
and taken into account in any subsequent adjustment required to be made 
hereunder.  All calculations under this Section 8 shall be made to the 
nearest cent or to the nearest one-hundredth of a share, as the case may be.  
Anything in this Section 8 to the contrary notwithstanding, the Company shall 
be entitled, but shall not be required, to make such changes in the Purchase 
Price, in addition to those required by this Section 8 as it shall determine, 
in its sole discretion, to be advisable in order that any dividend or 
distribution in shares of Common Stock or any subdivision, reclassification 
or combination of Common Stock, hereafter made by the Company shall not 
result in any Federal Income tax liability to the Registered Holder of Common 
Stock or securities convertible into Common Stock (including Warrants).

          (d)  Whenever the Purchase Price is adjusted, as herein provided, 
the Company shall promptly but no later than 20 days after any request for 
such an adjustment by the Registered Holder, cause a notice setting forth the 
adjusted Purchase Price and adjusted number of Shares issuable upon exercise 
of each Warrant, and, if requested, information describing the transactions 
giving rise to such adjustments, to be mailed to the Registered Holder at his 
last address appearing in the warrant register of the Warrant Agent, and 
shall cause a certified copy thereof  to be mailed to its Warrant Agent.  The 
Company may retain a firm of independent certified public accountants 
selected by the Board of Directors (who may be the regular accountants 
employed by the Company) to make any computations required by this Section 8, 
and a certificate signed by such firm shall be conclusive evidence of the 
correctness of such adjustment.

          (e)  In the event that at any time, as a result of an adjustment 
made pursuant to Subsection (a) above, the Registered Holder of this Warrant 
thereafter shall become entitled to receive any shares of the Company, other 
than Common Stock, thereafter the number of such other shares so receivable 
upon exercise of this Warrant shall be subject to adjustment from time to 
time in a manner and on terms as nearly equivalent as practicable to the 
provisions with respect to the Common Stock contained in Subsection (a) 
above.

          (f)  Irrespective of any adjustments in the Purchase Price or the 
number or kind of shares purchasable upon exercise of this Warrant, Warrants 
theretofore or thereafter issued may continue to express the same price and 
number and kind of shares as are stated in the similar Warrants initially 
issuable pursuant to this Agreement.

          SECTION 9.     RECLASSIFICATION, REORGANIZATION OR MERGER.  In case 
of any reclassification, capital reorganization or other change of 
outstanding shares of Common Stock of the Company, or in case of any 
consolidation  or merger of the Company with or into another corporation 
(other than a merger with a subsidiary in which merger the Company is the 
continuing corporation and which does not result in any reclassification, 
capital reorganization or other change of outstanding shares of Common Stock 
of the class issuable upon exercise of this Warrant) or in case of any sale, 
lease or conveyance to another corporation of the property of the Company as 
an entirety, the Company shall, as a condition precedent to such transaction, 
cause effective provisions to be made so that the holder shall have the right 
thereafter by exercising this Warrant at any time prior to the expiration of 
the Warrant, to purchase the kind and amount

                                       6

<PAGE>

of shares of stock and other securities and property receivable upon such 
reclassification, capital reorganization and other change, consolidation, 
merger, sale or conveyance by a holder of the number of shares of Common 
Stock which might have been purchased upon exercise of this Warrant 
immediately prior to such reclassification, change, consolidation, merger, 
sale or conveyance. Any such provision shall include provision for 
adjustments which shall be as nearly equivalent as may be practicable to the 
adjustments provided for in this Warrant.   The foregoing provisions of this 
Section 9 shall similarly apply to successive reclassifications, capital 
reorganizations and changes of shares of Common Stock and to successive 
consolidations, mergers, sales or conveyances. In the event that in 
connection with any such capital reorganization or reclassification, 
consolidation, merger, sale or conveyance, additional shares of Common Stock 
shall be issued in exchange, conversion, substitution or payment, in whole or 
in part, for a security of the Company other that Common Stock, any such 
issue shall be treated as an issue of Common Stock covered by the provisions 
of Subsection (a) of Section (8) hereof.

          SECTION 10.    FRACTIONAL WARRANTS AND FRACTIONAL SHARES.

          (a)  If the number of shares of Common Stock purchasable upon the 
exercise of each Warrant is adjusted pursuant to Section 8 hereof, the 
Company shall nevertheless not be required to issue fractions of shares, upon 
exercise of the Warrants or otherwise, or to distribute certificates that 
evidence fractional shares.  With respect to any fraction of a share called 
for upon any exercise hereof, the Company shall pay to the Holder an amount 
in cash equal to such fraction multiplied by the current market value of such 
fractional share, determined as follows:

          (1)  If the Common Stock is listed on a national securities 
               exchange or admitted to unlisted trading privileges on such 
               exchange or listed for trading on the Nasdaq National Market 
               System ("NMS"), the current market value shall be the last 
               reported sale price of the Common Stock on such exchange on 
               the last business day prior to the date of exercise of this 
               Warrant or if no such sale is made on such day or no closing 
               sale price is quoted, the average of the closing bid and asked 
               prices for such day on such exchange or system; or

          (2)  If the Common Stock is listed in the over-the-counter market 
               (other than on NMS) or admitted to unlisted trading 
               privileges, the current market value shall be the mean of the 
               last reported bid and asked prices reported by the National 
               Quotation Bureau, Inc. on the last business day prior to the 
               date of the exercise of this Warrant; or

          (3)  If the Common Stock is not so listed or admitted to unlisted 
               trading privileges and bid and asked prices are not so 
               reported, the current market value shall be prescribed by the 
               Board of Directors of the Company.

          SECTION 11.    WARRANT HOLDERS NOT DEEMED STOCKHOLDERS.  No holder 
of Warrants shall, as such, be entitled to vote or to receive dividends or be 
deemed the holder of Common Stock that may at any time be issuable upon 
exercise of such Warrants for any purpose whatsoever, nor shall anything 
contained herein be construed to confer upon the holder of Warrants, as such, 
any of the rights of a stockholder of the Company or any right to vote for 
the election of directors or upon any matter submitted to stockholders at any 
meeting thereof, or to give or withhold consent to any corporate action 
(whether upon any recapitalization, issue or

                                       7

<PAGE>

reclassification of stock, change of par value or change of stock to no par 
value, consolidation, merger or conveyance or otherwise), or to receive 
notice of meetings, or to receive dividends or subscription rights, until 
such Holder shall have exercised such Warrants and been issued shares of 
Common Stock in accordance with the provisions hereof.

          SECTION 12.    RIGHTS OF ACTION.  All rights of action with respect 
to this Agreement are vested in the respective Registered Holders of the 
Warrants, and any Registered Holder of a Warrant, without consent of the 
Warrant Agent or of the holder of any other Warrant, may, on his own behalf 
and for his own benefit, enforce against the Company his right to exercise 
his Warrants for the purchase of shares of Common Stock in the manner 
provided in the Warrant Certificate and this Agreement.

          SECTION 13.    AGREEMENT OF WARRANT HOLDERS.  Every holder of a 
Warrant, by his acceptance thereof, consents and agrees with the Company, the 
Warrant Agent and every other holder of a Warrant that:

          (a)  The Warrants are transferable only on the registry books of 
the Warrant Agent by the Registered Holder thereof in person or by his 
attorney duly authorized in writing and only if the Warrant Certificates 
representing such Warrants are surrendered at the office of the Warrant 
Agent, duly endorsed or accompanied by a proper instrument of transfer 
satisfactory to the Warrant Agent and the Company in their sole discretion, 
together with payment of any applicable transfer taxes; and

          (b)  The Company may deem and treat the person in whose name the 
Warrant Certificate is registered as the holder and as the absolute, true and 
lawful owner of the Warrants represented thereby for all purposes, and the 
Company shall not be affected by any notice or knowledge to the contrary, 
except as otherwise expressly provided in Section 7 hereof.

          SECTION 14.    CANCELLATION OF WARRANT CERTIFICATES.  If the 
Company shall purchase or acquire any Warrant or Warrants, the Warrant 
Certificate or Warrant Certificates evidencing the same shall thereupon be 
canceled by it and retired.  The Warrant Agent shall also cancel Common Stock 
following exercise of any or all of the Warrants represented thereby or 
delivered to it for transfer, split up, combination or exchange.

          SECTION 15.    CONCERNING THE WARRANT AGENT.  The Warrant Agent 
acts hereunder as agent and in a ministerial capacity for the Company, and 
its duties shall be determined solely by the provisions hereof.  The Warrant 
Agent shall not, by issuing and delivering Warrant Certificates or by any 
other act hereunder be deemed to make any representations as to the validity, 
value or authorization of the Warrant Certificates or the Warrants 
represented thereby or of any securities or other property delivered upon 
exercise of any Warrant or whether any stock issued upon exercise of any 
Warrant is fully paid and nonassessable.

          The Warrant Agent shall account promptly to the Company with 
respect to Warrants exercised and concurrently pay the Company, as provided 
in Section 4, all moneys received by the Warrant Agent upon the exercise of 
such Warrants.  The Warrant Agent shall, upon request of the Company from 
time to time, deliver to the Company such complete reports of registered 
ownership of the Warrants and such complete records of transactions with 
respect

                                       8

<PAGE>

to the Warrants and the shares of Common Stock as the Company may request.  
The Warrant Agent shall also make available to the Company and Paramount for 
inspection by their agents or employees, from time to time as either of them 
may request, such original books of accounts and record (including original 
Warrant Certificates surrendered to the Warrant Agent upon exercise of 
Warrants) as may be maintained by the Warrant Agent in connection with the 
issuance and exercise of Warrants hereunder, such inspections to occur at the 
Warrant Agent's office as specified in Section 17, during normal business 
hours.

          The Warrant Agent shall not at any time be under any duty or 
responsibility to any holder of Warrant Certificates to make or cause to be 
made any adjustment of the Purchase Price provided in this Agreement, or to 
determine whether any fact exists which may require any such adjustments, or 
with respect to the nature or extent of any such adjustment, when made, or 
with respect to the method employed in making the same.  It shall not (i) be 
liable for any recital or statement of facts contained herein or for any 
action taken, suffered or omitted by it in reliance on any Warrant 
Certificate or other document or instrument believed by it in good faith to 
be genuine and to have been signed or presented by the proper party or 
parties, (ii) be responsible for any failure on the part of the Company to 
comply with any of its covenants and obligations contained in this Agreement 
or in any Warrant Certificate, or (iii) be liable for any act or omission in 
connection with this Agreement except for its own negligence or willful 
misconduct.

          The Warrant Agent may at any time consult with counsel satisfactory 
to it (who may be counsel for the Company) and shall incur no liability or 
responsibility for any action taken, suffered or omitted by it in good faith 
in accordance with the written opinion or advice of such counsel.

          Any notice, statement, instruction, request, direction, order or 
demand of the Company shall be sufficiently evidenced by an instrument signed 
by the Chairman of the Board, President, any Vice President, its Secretary, 
or Assistant Secretary, (unless other evidence in respect thereof is herein 
specifically prescribed).  The Warrant Agent shall not be liable for any 
action taken, suffered or omitted by it in accordance with such notice, 
statement, instruction, request, direction, order or demand believed by it to 
be genuine.

          The Company agrees to pay the Warrant Agent reasonable compensation 
for its services hereunder and to reimburse it for its reasonable expenses 
hereunder; it further agrees to indemnify the Warrant Agent and save it 
harmless against any and all losses, expenses and liabilities, including 
judgments, costs and counsel fees, for anything done or omitted by the 
Warrant Agent in the execution of its duties and powers hereunder except 
losses, expenses and liabilities arising as a result of the Warrant Agent's 
negligence or willful misconduct.

          The Warrant Agent may resign its duties and be discharged from all
further duties and liabilities hereunder (except liabilities arising as a result
of the Warrant Agent's own negligence or willful misconduct), after giving 30
days' prior written notice to the Company.  At least 15 days prior to the date
such resignation is to become effective, the Warrant Agent shall cause a copy of
such notice of resignation to be mailed to the Registered Holder of each Warrant
Certificate at the Company's expense.  Upon such resignation, or any inability
of the Warrant Agent to act as such hereunder, the Company shall appoint a new
warrant agent in writing.  If the Company shall fail to make such appointment
within a period of 15 days after it has been

                                       9

<PAGE>

notified in writing of such resignation by the resigning Warrant Agent, then 
the Registered Holder of any Warrant Certificate may apply to any court of 
competent jurisdiction for the appointment of a new warrant agent.  Any new 
warrant agent, whether appointed by the Company or by such a court, shall be 
a bank or trust company having a capital and surplus, as shown by its last 
published report to its stockholders, of not less than $10,000,000 or a stock 
transfer company.  After acceptance in writing of such appointment by the new 
warrant agent is received by the Company, such new warrant agent shall be 
vested with the same powers, rights, duties and responsibilities as if it had 
been originally named herein as the Warrant Agent, without any further 
assurance, conveyance, act or deed; but if for any reason it shall be 
necessary or expedient to execute and deliver any further assurance, 
conveyance, act or deed, the same shall be done at the expense of the Company 
and shall be legally and validly executed and delivered by the resigning 
Warrant Agent.  Not later than the effective date of any such appointment the 
Company shall file notice thereof with the resigning Warrant Agent and shall 
forthwith cause a copy of such notice to be mailed to the Registered Holder 
of each Warrant Certificate.

          Any corporation into which the Warrant Agent or any new warrant 
agent may be converted or merged or any corporation resulting from any 
consolidation to which the Warrant Agent or any new warrant agent shall be a 
party or any corporation succeeding to the trust business of the Warrant 
Agent shall be a successor warrant agent under this Agreement without any 
further act, provided that such corporation is eligible for appointment as 
successor to the Warrant Agent under the provisions of the preceding 
paragraph.  Any such successor warrant agent shall promptly cause notice of 
its succession as warrant agent to be mailed to the Company and to the 
Registered Holder of each Warrant Certificate.

          The Warrant Agent, its subsidiaries and affiliates, and any of its 
or their officers or directors, may buy and hold or sell Warrants or other 
securities of the Company and otherwise deal with the Company in the same 
manner and to the same extent and with like effects as though it were not 
Warrant Agent.  Nothing herein shall preclude the Warrant Agent from acting 
in any other capacity for the Company or for any other legal entity.

          SECTION 16.    MODIFICATION OF AGREEMENT.  The parties hereto may 
by supplemental agreement make any changes or corrections in this Agreement 
(i) that it shall deem appropriate to cure any ambiguity or to correct any 
defective or inconsistent provision or manifest mistake or error herein 
contained; (ii) that it may deem necessary or desirable and which shall not 
adversely affect the interests of the holders of Warrant Certificates; 
PROVIDED, HOWEVER, that this Agreement shall not otherwise be modified, 
supplemented or altered in any respect except with the consent in writing of 
the Registered Holders of Warrant Certificates representing not less than 50% 
of the Warrants then outstanding; and PROVIDED, FURTHER, that no change in 
the number or nature of the securities purchasable upon the exercise of any 
Warrant, or the Purchase Price therefor, or the acceleration of the Warrant 
Expiration Date, shall be made without the consent in writing of the 
Registered Holder of the Warrant Certificate representing such Warrant, other 
than such changes as are specifically prescribed by this Agreement as 
originally executed.

          SECTION 17.    NOTICES.  All notices, requests, consents and other
communications hereunder shall be in writing and shall be deemed to have been
made when delivered or mailed first class registered or certified mail, postage
prepaid as follows: if to the

                                       10

<PAGE>

Registered Holder of a Warrant Certificate, at the address of such holder as 
shown on the registry books maintained by the Warrant Agent; if to the 
Company, at 6555 Nancy Ridge Drive, Suite 200, San Diego, California 92121, 
Attention:  Dale A. Sander, and if to the Warrant Agent, at 40 Wall Street, 
New York, NY 10005, Attention               .

          SECTION 18.    GOVERNING LAW.  This Agreement shall be governed by 
and construed in accordance with the laws of the State of New York, without 
reference to its  principles of conflict of laws.

          SECTION 19.    BINDING EFFECT.  This Agreement shall be binding 
upon and inure to the benefit of the Company and the Warrant Agent (and their 
respective successors and assigns) and the holders from time to time of 
Warrant Certificates.  Nothing in this Agreement is intended or shall be 
construed to confer upon any other person any right, remedy or claim, in 
equity or at law, or to impose upon any other person any duty, liability or 
obligation.

          SECTION 20.    TERMINATION.  This Agreement shall terminate on the 
earlier to occur of (i)  the close of business on the Expiration Date of all 
the Warrants; (ii) the date upon which all Warrants have been exercised.

          SECTION 21.    COUNTERPARTS.  This Agreement may be executed in 
several counterparts, which taken together shall constitute a single document.

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement 
to be duly executed as of the date first above written.

                              XYTRONYX, INC.



                              By: /s/   Dale A. Sander              
                                  ----------------------------------
                                Dale A. Sander
                                Chief Financial Officer


                              AMERICAN STOCK TRANSFER 
                              & TRUST COMPANY


                              By: /s/  Herbert J. Lemmer             
                                  ----------------------------------
                                Name:  Herbert J. Lemmer
                                Title:    Vice-President    


                                       11



<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
SEPTEMBER 30, 1996 INTERIM FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAR-31-1997
<PERIOD-START>                             APR-01-1996
<PERIOD-END>                               SEP-30-1996
<CASH>                                         194,182
<SECURITIES>                                         0
<RECEIVABLES>                                   11,467
<ALLOWANCES>                                     8,772
<INVENTORY>                                     35,320
<CURRENT-ASSETS>                               474,050
<PP&E>                                         805,291
<DEPRECIATION>                                 690,070
<TOTAL-ASSETS>                                 767,351
<CURRENT-LIABILITIES>                        1,069,642
<BONDS>                                         15,398
                                0
                                          0
<COMMON>                                       162,396
<OTHER-SE>                                   (480,085)
<TOTAL-LIABILITY-AND-EQUITY>                   767,351
<SALES>                                         12,697
<TOTAL-REVENUES>                                55,930
<CGS>                                           21,168
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                             1,289,421
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               6,081
<INCOME-PRETAX>                            (1,955,363)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (1,955,363)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (1,955,363)
<EPS-PRIMARY>                                    (.24)
<EPS-DILUTED>                                    (.24)
        

</TABLE>


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