INTERWEST PARTNERS V LP
SC 13G/A, 1999-02-09
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                                (Amendment no. 1)


                          Coulter Pharmaceutical, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   222116 10 5
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                               Page 1 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 2 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           InterWest Partners V, LP
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           California
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     1,799,825
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        0
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        1,799,825
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        0
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,799,825
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.0%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           PN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 2 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 3 of 14 Pages
         ------------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           InterWest Management Partners V, L.P.
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           California
- ------------------------------ -------- --------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     1,799,825
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        0
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        1,799,825
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        0
- ---------- -------------------------------------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,799,825
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.0%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           PN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 3 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 4 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           Alan W. Crites
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     0
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,811,144
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        0
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,811,144
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,811,144
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.0%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 4 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 5 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           Philip T. Gianos
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     0
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,799,825
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        0
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,799,825
- ---------- -------------------------------------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,799,825
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.0%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 5 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 6 of 14 Pages
         ------------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           Wallace R. Hawley
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     10,852
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,811,144
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        10,852
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,811,144
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,821,996
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.1%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 6 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 7 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           W. Scott Hedrick
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     110
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,811,144
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        110
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,811,144
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,811,254
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.0%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 7 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 8 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           W. Stephen Holmes
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ------------------------------ -------- --------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     3,000
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,811,144
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        3,000
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,811,144
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,814,144
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.1%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 8 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                        Page 9 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           Robert R. Momsen
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     5,000
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,811,144
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        5,000
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,811,144
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,816,144
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.1%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 9 of 14 pages

<PAGE>


<TABLE>
<CAPTION>
<S>                                                            <C>                   <C>
- -----------------------------------------------                                      -----------------------------------
                                                               13G
CUSIP No. 222116 10 5                                                                       Page 10 of 14 Pages
          -----------                                                                                          
- -----------------------------------------------                                      -----------------------------------

- ---------- -------------------------------------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           Arnold L. Oronsky
- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                              (a) [ ]
                                                                                                          (b) [ ]
- ---------- -------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY
- ---------- -------------------------------------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
- ---------- -------------------------------------------------------------------------------------------------------------
                                  5     SOLE VOTING POWER

          NUMBER OF                     0
                               -------- --------------------------------------------------------------------------------
           SHARES                 6     SHARED VOTING POWER
    BENEFICIALLY OWNED BY
                                        1,799,825
                               -------- --------------------------------------------------------------------------------
 EACH REPORTING PERSON WITH       7     SOLE DISPOSITIVE POWER

                                        0
                               -------- --------------------------------------------------------------------------------
                                  8     SHARED DISPOSITIVE POWER

                                        1,799,825
- ------------------------------ -------- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,799,825
- ---------- -------------------------------------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ---------- -------------------------------------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           11.0%
- ---------- -------------------------------------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IN
- ---------- -------------------------------------------------------------------------------------------------------------
<FN>
                                          *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 10 of 14 pages

<PAGE>


Item 1.

(a)      Name of Issuer:  Coulter Pharmaceutical, Inc. ("Issuer")


(b)      Address of Issuer's Principal Executive Offices:

         550 California Avenue, Suite 200
         Palo Alto, CA 94306

Item 2.

(a)      Name of Person(s) Filing:

         InterWest Partners V, L.P. ("IWP V")
         InterWest Management Partners V, L.P. ("IMP V")
         Alan W. Crites ("Crites")
         Philip T. Gianos ("Gianos")
         Wallace R. Hawley ("Hawley")
         W. Scott Hedrick ("Hedrick")
         W. Stephen Holmes ("Holmes")
         Robert R. Momsen ("Momsen")
         Arnold L. Oronsky ("Oronsky")

(b)      Address of Principal Business Office or, if none, Residence:

         3000 Sand Hill Road
         Building 3, Suite 255
         Menlo Park, CA 94025

(c)      Citizenship/Place of Organization:

         IWP V:       California
         IMP V:       California
         Crites:      United States
         Gianos:      United States
         Hawley:      United States
         Hedrick:     United States
         Holmes:      United States
         Momsen:      United States
         Oronsky:     United States

(d)      Title of Class of Securities:  Common Stock

(e)      CUSIP Number:     222116 10 5

Item 3.        Not applicable.

                              Page 11 of 14 pages

<PAGE>


<TABLE>
Item 4         Ownership.

<CAPTION>
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------

                        IWP V
                        IMP V      Crites       Gianos       Hawley       Hedrick      Holmes      Oronsky      Momsen
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------
<S>                   <C>        <C>           <C>         <C>          <C>          <C>           <C>        <C>        
(a)     Beneficial
        Ownership     1,799,825  1,811,144**   1,799,825   1,821,996**  1,811,254**  1,814,144**   1,799,825  1,816,144**
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------
(b)     Percentage
        of Class          11.0%        11.0%       11.0%         11.1%        11.0%        11.1%       11.0%        11.1%
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------
(c)     Sole Voting
        Power         1,799,825            0           0        10,852          110        3,000           0        5,000
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------
        Shared
        Voting
        Power                 0    1,811,144   1,799,825     1,811,144    1,811,144    1,811,144   1,799,825    1,811,144
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------
        Sole
        Dispositive
        Power         1,799,825            0           0        10,852          110        3,000           0        5,000
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------
        Shared
        Dispositive
        Power                 0    1,811,144   1,799,825     1,811,144    1,811,144    1,811,144   1,799,825    1,811,144
- ------- ------------- ---------- ------------ ----------- ------------- ------------ ------------ ----------- ------------

<FN>
**Includes 11,319 shares of Issuer's Common stock held by InterWest Investors V,
a general partnership,  of which Crites, Hawley,  Hedrick, Holmes and Momsen are
general partners
</FN>
</TABLE>

Item 5.        Ownership of Five Percent or Less of a Class

Not applicable.

Item 6.        Ownership of More than Five Percent on Behalf of Another Person

Under certain circumstances set forth in the partnership agreement of IMP V, the
general  partners and/or limited  partners of such partnership have the right to
receive  dividends  from,  or the proceeds from the sale of, the Common Stock of
Issuer beneficially owned by such Partnership.

Item 7.        Identification   and   Classification  of  the  Subsidiary  Which
               Acquired the  Security  Being  Reported on By the Parent  Holding
               Company.

Not applicable.

Item 8.        Identification and Classification of Members of the Group

No   reporting   person  is  a  member  of  a  group  as   defined   in  section
240.13d-1(b)(1)(iii)(H) of the Act.

Item 9.        Notice of Dissolution of Group

Not applicable.

Item 10.       Certification

Not applicable

EXHIBITS

A.    Joint Filing Statement

                              Page 12 of 14 pages

<PAGE>


                                    Signature

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Date:    February ____, 1999


INTERWEST PARTNERS V, L.P.

By: InterWest Management Partners V, L.P.           ____________________________
                                                    Alan W. Crites
    By: _________________________________
        General Partner                             ____________________________
                                                    Philip T. Gianos
INTERWEST MANAGEMENT PARTNERS V, L.P.
                                                    ____________________________
By:  _________________________________              Wallace R. Hawley
     General Partner
                                                    ____________________________
                                                    W. Scott Hedrick

                                                    ____________________________
                                                    W. Stephen Holmes

                                                    ____________________________
                                                    Robert R. Momsen

                                                    ____________________________
                                                    Arnold L. Oronsky

                              Page 13 of 14 pages

<PAGE>


                                    EXHIBIT A

We, the undersigned, hereby express our agreement that the attached Schedule 13G
is filed on behalf of each of us.

Date:    February ____, 1999


INTERWEST PARTNERS V, L.P.

By: InterWest Management Partners V, L.P.           ____________________________
                                                    Alan W. Crites
    By: _________________________________
        General Partner                             ____________________________
                                                    Philip T. Gianos
INTERWEST MANAGEMENT PARTNERS V, L.P.
                                                    ____________________________
By:  _________________________________              Wallace R. Hawley
     General Partner
                                                    ____________________________
                                                    W. Scott Hedrick

                                                    ____________________________
                                                    W. Stephen Holmes

                                                    ____________________________
                                                    Robert R. Momsen

                                                    ____________________________
                                                    Arnold L. Oronsky

                              Page 14 of 14 pages



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