SERAGEN INC
SC 13G/A, 1997-02-13
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                                 SCHEDULE 13G


                  UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (AMENDMENT NO. 4)*


                                Seragen, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)


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


                                  817474 109
                         -------------------------------
                                (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 12 pages
<PAGE>   2



- ------------------------                             --------------------------
  CUSIP NO. 817474 109               13G               PAGE 2  OF 12  PAGES
            ----------                                     ---    ---
- ------------------------                              -------------------------

- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Boston University Nominee Partnership
          
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a)    [x]

                                                                     (b)    [ ]
- --------------------------------------------------------------------------------
3         SEC USE ONLY


- --------------------------------------------------------------------------------
4         CITIZENSHIP OR PLACE OF ORGANIZATION

          Massachusetts
- --------------------------------------------------------------------------------
                            5    SOLE VOTING POWER 
                                    -0-
                                    
         NUMBER OF      --------------------------------------------------------
          SHARES            6    SHARED VOTING POWER 
       BENEFICIALLY                 8,299,077
         OWNED BY                         
           EACH         --------------------------------------------------------
        REPORTING           7    SOLE DISPOSITIVE POWER 
          PERSON                    -0-
           WITH                     
                        --------------------------------------------------------
                            8    SHARED DISPOSITIVE POWER  
                                    8,299,077
                                          
- --------------------------------------------------------------------------------
9         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


          8,299,077
- --------------------------------------------------------------------------------
10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN     [ ]
          SHARES*

          Excludes 8,000 shares beneficially owned by Dr. Bagalay and 9,200
          shares beneficially owned by Mr. Condon, as to which the Partnership
          disclaims beneficial ownership pursuant to Rule 13d-4.

- --------------------------------------------------------------------------------
11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          46.1%
- --------------------------------------------------------------------------------
12        TYPE OF REPORTING PERSON *

          PN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 2 of 12 pages

<PAGE>   3



- ------------------------                             --------------------------
  CUSIP NO. 817474 109               13G               PAGE 3  OF  12  PAGES
            ----------                                     ---    ---
- ------------------------                              -------------------------

- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John E. Bagalay, Jr.
          
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a)    [x]

                                                                     (b)    [ ]
- --------------------------------------------------------------------------------
3         SEC USE ONLY


- --------------------------------------------------------------------------------
4         CITIZENSHIP OR PLACE OF ORGANIZATION

          United States
- --------------------------------------------------------------------------------
                            5    SOLE VOTING POWER   
                                    8,000
                                    
         NUMBER OF      --------------------------------------------------------
          SHARES            6    SHARED VOTING POWER 
       BENEFICIALLY                 8,299,077
         OWNED BY                         
           EACH         --------------------------------------------------------
        REPORTING           7    SOLE DISPOSITIVE POWER
          PERSON                    8,000
           WITH                     
                        --------------------------------------------------------
                            8    SHARED DISPOSITIVE POWER  
                                    8,299,077
                                          
- --------------------------------------------------------------------------------
9         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          8,307,077
     
- --------------------------------------------------------------------------------
10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN     [ ]
          SHARES*

          Excludes 9,200 shares beneficially owned by Mr. Condon, as to which
          Dr. Bagalay disclaims beneficial ownership pursuant to Rule 13d-4.

- --------------------------------------------------------------------------------
11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          46.1%
- --------------------------------------------------------------------------------
12        TYPE OF REPORTING PERSON *

          IN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 3 of 12 pages

<PAGE>   4



- ------------------------                             --------------------------
  CUSIP NO. 817474 109               13G               PAGE  4  OF 12  PAGES
            ----------                                      ---   ---
- ------------------------                              -------------------------

- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Kenneth G. Condon
          
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a)    [x]

                                                                     (b)    [ ]
- --------------------------------------------------------------------------------
3         SEC USE ONLY


- --------------------------------------------------------------------------------
4         CITIZENSHIP OR PLACE OF ORGANIZATION

          United States
- --------------------------------------------------------------------------------
                            5    SOLE VOTING POWER  
                                    9,200
                                    
         NUMBER OF      --------------------------------------------------------
          SHARES            6    SHARED VOTING POWER
       BENEFICIALLY                 8,299,077
         OWNED BY                         
           EACH         --------------------------------------------------------
        REPORTING           7    SOLE DISPOSITIVE POWER 
          PERSON                    9,200
           WITH                     
                        --------------------------------------------------------
                            8    SHARED DISPOSITIVE POWER 
                                    8,299,077
                                          
- --------------------------------------------------------------------------------
9         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          8,308,277

- --------------------------------------------------------------------------------
10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN     [ ]
          SHARES*

          Excludes 8,000 shares beneficially owned by Dr. Bagalay, as to which
          Mr. Condon disclaims beneficial ownership pursuant to Rule 13d-4.

- --------------------------------------------------------------------------------
11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          46.1%
- --------------------------------------------------------------------------------
12        TYPE OF REPORTING PERSON *

          IN 
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 4 of 12 pages

<PAGE>   5



- ------------------------                             --------------------------
  CUSIP NO. 817474 109               13G               PAGE  5  OF 12  PAGES
            ----------                                      ---   ---
- ------------------------                              -------------------------

- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Martin J. Howard
          
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a)    [x]

                                                                     (b)    [ ]
- --------------------------------------------------------------------------------
3         SEC USE ONLY


- --------------------------------------------------------------------------------
4         CITIZENSHIP OR PLACE OF ORGANIZATION

          United States
- ------------------------------------------------------------------------------
                            5    SOLE VOTING POWER
                                    -0-
                                                                       
         NUMBER OF      --------------------------------------------------------
          SHARES            6    SHARED VOTING POWER
       BENEFICIALLY                 8,299,077
         OWNED BY                         
           EACH         --------------------------------------------------------
        REPORTING           7    SOLE DISPOSITIVE POWER
          PERSON                    -0-
           WITH                     
                        --------------------------------------------------------
                            8    SHARED DISPOSITIVE POWER 
                                    8,299,077
                                          
- --------------------------------------------------------------------------------
9         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          8,299,077
         
- --------------------------------------------------------------------------------
10        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN     [ ]
          SHARES*

          Excludes 8,000 shares beneficially owned by Dr. Bagalay and 9,200
          shares owned by Mr. Condon, as to which Mr. Howard disclaims
          beneficial ownership pursuant to Rule 13d-4.

- --------------------------------------------------------------------------------
11        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          46.1%
- --------------------------------------------------------------------------------
12        TYPE OF REPORTING PERSON *

          IN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 5 of 12 pages

<PAGE>   6



Item 1(a)     Name of Issuer
              --------------

              Seragen, Inc.

Item 1(b)     Address of Issuer's Principal Executive Offices
              -----------------------------------------------

              97 South Street
              Hopkinton, MA 01748
          
Item 2(a)     Name of Person Filing
              ---------------------

              Boston University Nominee Partnership (the "Partnership"); and
              John E. Bagalay, Jr., Kenneth G. Condon, and Martin J. Howard,
              who are each partners of the Partnership. Each of the foregoing
              persons or entities is referred to herein individually as a
              "Reporting Person" or collectively as the "Reporting Persons".


Item 2(b)     Address of Principal Business Office, or, if None, Residence
              ------------------------------------------------------------

              The address of the principal business office of the Partnership
              is 881 Commonwealth Ave., Boston, MA 02215. The principal
              business address of Dr. Bagalay, Mr. Condon and Mr. Howard is 147
              Bay State Road, Boston, Massachusetts 02215.
            
Item 2(c)     State of Organization/Citizenship
              ---------------------------------

              The Partnership was organized under the laws of the Commonwealth
              of Massachusetts. Each of Dr. Bagalay, Mr. Condon and Mr. Howard
              is a United States citizen.


Item 2(d)     Title of Class of Securities
              ----------------------------

              Common Stock ("Shares")


Item 2(e)     CUSIP Number
              ------------

              817474109


Item 3.       If this statement is filed pursuant to Rules 13d-1(b),
              ------------------------------------------------------
              or 13d-2(b), check whether the person filing is a:
              ------------------------------------------------------

      (a)     [ ]   Broker or Dealer registered under Section 15 of the Act

      (b)     [ ]   Bank as defined in Section 3(a)(6) of the Act


                              Page 6 of 12 pages
<PAGE>   7
      (c)     [ ]   Insurance Company as defined in Section 3(a)(19) of the Act

      (d)     [ ]   Investment Company registered under Section 8 of the
                    Investment Company Act

      (e)     [ ]   Investment Adviser registered under Section 203 of the
                    Investment Advisers Act of 1940,

      (f)     [ ]   Employee Benefit Plan, Pension Fund which is subject to the
                    provisions of the Employee Retirement Income Security Act of
                    1974 or Endowment Fund; see [section]240.13d-1(b)(1)(ii)(F),

      (g)     [ ]   Parent Holding Company, in accordance with 
                    [section]240.13d-1(b)(ii)(G)

      (h)     [ ]   Group, in accordance with [section]240.13d-1(b)(1)(ii)(H).

      Not applicable.


Item 4.   Ownership
          ---------

          (a)    Amount Beneficially Owned:    Each Reporting Person may be
          deemed to own 8,316,277 Shares, which ownership is comprised of
          8,299,077 Shares registered in the name of the Partnership, 8,000
          Shares registered in the name of Dr. Bagalay and 9,200 Shares 
          registered in the name of Mr. Condon.**

          (b)    Percent of Class:       Each Reporting Person may be deemed
          to beneficially own 46.1% of the Shares of Seragen, Inc. The foregoing
          percentage was calculated based on the 17,998,014 Shares which the
          Company has advised the Reporting Person were outstanding as of
          January 30, 1997.**
                   

          (c)    Number of shares as to which such person has:

                 (i)       sole power to vote or to direct the vote:
                 Dr. Bagalay: 8,000. Mr. Condon: 9,200.
                            
                 (ii)      shared power to vote or to direct the vote:
                 Each Reporting Person: 8,299,077. The Partnership is the
                 record owner of 8,299,077 Shares. As the partners of the
                 Partnership, Dr. Bagalay, Mr. Condon and Mr. Howard may be
                 deemed to share the power to vote or to direct the vote of
                 the Shares held of record by the Partnership.
                            

                              Page 7 of 12 pages



<PAGE>   8
           (iii)     sole power to dispose or to direct the disposition
           of: Dr. Bagalay: 8,000. Mr. Condon: 9,200.
                      
           (iv)      shared power to dispose or to direct the disposition
           of: Each Reporting Person: 8,299,077. As the partners of the
           Partnership, Dr. Bagalay, Mr. Condon and Mr. Howard may be
           deemed to share the power to dispose or to direct the 
           disposition of the Shares held of record by the Partnership.
          

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
          ---------------------------------------------------------------

          Boston University, on whose behalf Boston University Nominee
          Partnership holds the Shares, has the right to receive or the power
          to direct the receipt of dividends from, or the proceeds from the
          sale of, the 8,299,077 Shares held by the 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
          ---------------------------------------------------------

          See EXHIBIT 1 hereto stating the identity of each member of the
          group.

Item 9.   Notice of Dissolution of Group
          ------------------------------

          Not applicable.

Item 10.  Certification
          -------------

          By signing below I certify that, to the best of my knowledge and
          belief, the securities referred to above were acquired in the
          ordinary course of business and were not acquired for the purpose of
          and do not have the effect of changing or influencing the control of
          the issuer of such securities and were not acquired in connection
          with or as a participant in any transaction having such purposes or
          effect.  


                              Page 8 of 12 pages

<PAGE>   9
** The Partnership and Mr. Howard expressly disclaim beneficial ownership of the
Shares which are held, and which may be deemed to be owned, by each of the
Partnership and Dr. Bagalay and Mr. Condon.

     Dr. Bagalay expressly disclaims beneficial ownership of the Shares which
are held, and may be deemed to be owned, by each of the Partnership, Mr. Condon
and Mr. Howard.


     Mr. Condon expressly disclaims beneficial ownership of the Shares which are
held, and may be deemed to be owned, by each of the Partnership, Dr. Bagalay and
Mr. Howard.



                               Page 9 of 12 pages

<PAGE>   10



     Signature
     ---------

     After reasonably 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. We also hereby agree to file this statement jointly pursuant to the
Agreement set forth as EXHIBIT 2 hereto.

                                            Boston University Nominee
                                            Partnership


Date:   January 30, 1997                    By: /s/ John E. Bagalay, Jr.
                                               -------------------------
                                               John E. Bagalay, Jr., Partner



                                            Partners:

                                               /s/ John E. Bagalay, Jr.
                                               -------------------------
                                               John E. Bagalay, Jr.


                                               /s/ Kenneth G. Condon
                                               -------------------------
                                               Kenneth G. Condon


                                               /s/ Martin J. Howard 
                                               -------------------------
                                               Martin J. Howard





                               Page 10 of 12 pages


<PAGE>   1



                  EXHIBIT 1 TO AMENDMENT NO. 4 TO SCHEDULE 13G
                            FOR REPORTING PERSONS OF

                                  SERAGEN, INC.
                                  -------------



     Each of Dr. Bagalay, Mr. Condon and Mr. Howard are partners of the Boston
University Nominee Partnership, a partnership created to act as record holder of
certain securities owned by Boston University (the "Partnership"). Dr. Bagalay,
Mr. Condon and Mr. Howard are partners of the Partnership and are required to
vote and/or dispose of the shares of Seragen, Inc., on behalf of Boston
University, as they are instructed by duly authorized officers of Boston
University.

     The Partnership and Mr. Howard expressly disclaim beneficial ownership of
the Shares which are held, and which may be deemed to be owned, by each of the
Partnership and Dr. Bagalay and Mr. Condon for purposes of Section 13(d) or
13(g).

     Dr. Bagalay expressly disclaims beneficial ownership of the Shares which
are held, and may be deemed to be owned, by each of the Partnership, Mr. Condon
and Mr. Howard for purposes of Section 13(d) or 13(g).

     Mr. Condon expressly disclaims beneficial ownership of the Shares which are
held, and may be deemed to be owned, by each of the Partnership, Dr. Bagalay and
Mr. Howard for purposes of Section 13(d) or 13(g).




                               Page 11 of 12 pages

<PAGE>   2


                                    EXHIBIT 1
                                    ---------

                     TO AMENDMENT NO. 4 TO SCHEDULE 13G FOR
                       REPORTING PERSONS OF SERAGEN, INC.

                                    AGREEMENT

     Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, the
undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Seragen, Inc.

     This Agreement may be executed in any number of counterparts, each of which
shall be deemed an original.

     EXECUTED this 30th day of January, 1997.


                                       Boston University Nominee Partnership


                                       By: /s/ John E. Bagalay, Jr.
                                          -----------------------------------
                                          John E. Bagalay, Jr., Partner


                                       Partners

                                           /s/ John E. Bagalay, Jr.
                                           ----------------------------------
                                           John E. Bagalay, Jr.


                                           /s/ Kenneth G. Condon
                                           ----------------------------------
                                           Kenneth G. Condon


                                           /s/ Martin J. Howard
                                           ----------------------------------
                                           Martin J. Howard






                               Page 12 of 12 pages



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