PPM AMERICA INC/IL
SC 13G, 1999-02-12
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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. __)*

                          Therapeutic Antibodies Inc.
- -------------------------------------------------------------------------------
                               (Name of Issuer)

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

                                   88337M100
                            ----------------------
                                (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 7 pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 88337M100                 13G                  Page 2 of 7 Pages
- -----------------------                                  ---------------------
                                      
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      PPM America, Inc.
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            4,761,900

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             4,761,900
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      4,761,900
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
      Not Applicable
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      9.14%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
      IA

- ------------------------------------------------------------------------------
                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
Item 1(a)      Name of Issuer:

                    Therapeutic Antibodies Inc.

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

                    1207 17th Avenue South, Suite 103
                    Nashville, TN  37212

Item 2(a)      Name of Person Filing:

                    PPM America, Inc.

Item 2(b)      Address of Principal Business Office:

                    225 West Wacker Drive, Suite 1200
                    Chicago, Illinois 60606

Item 2(c)      Citizenship:

                    Delaware

Item 2(d)      Title of Class of Securities:

                    Common Stock

Item 2(e)      CUSIP Number:

                    88337M100

Item 3         Type of Person:

                    (e) PPM America, Inc. is an investment adviser.


                               Page 3 of 7 pages
<PAGE>
 
Item 4         Ownership (at December 31, 1998):

                    (a)  Amount owned "beneficially" within the meaning of rule
                         13d-3:

                         4,761,900 shares

                    (b)  Percent of class:

                         9.14%

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

                                (i)  sole power to vote or to direct the vote:
                                     4,761,900
                               (ii)  shared power to vote or to direct the vote:
                                     None
                              (iii)  sole power to dispose or to direct the
                                     disposition of:  4,761,900
                               (iv)  shared power to dispose or to direct
                                     disposition of:  None

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:

                    Not Applicable

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 A

Item 9         Notice of Dissolution of Group:

                    Not Applicable


                               Page 4 of 7 pages
<PAGE>
 
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 purpose or effect.



                               Page 5 of 7 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 12, 1999

               The undersigned corporation, on the date above written, agrees
               and consents to the joint filing on its behalf of this Schedule
               13G in connection with its beneficial ownership of the security
               reported herein.

                                 PPM AMERICA, INC.

                                 By: /s/ Paul Carter
                                     -----------------------------
                                      Paul Carter
                                      Vice President - Compliance


                               Page 6 of 7 pages
<PAGE>
 
                                   EXHIBIT A
                                   ---------
                                        
Identification and Classification of the Members of the Group.

     By no-action relief granted on July 5, 1991, the SEC generally stated it
would not recommend enforcement action if Prudential Corporation plc together
with certain of its subsidiaries collectively reported beneficial ownership of
more than 5% of a class of equity security subject to Section 13(d) of the
Securities Exchange Act of 1934 on Schedule 13G rather than Schedule 13D.
Therefore, PPM America, Inc., a subsidiary of Prudential Corporation plc, is
making this filing on behalf of certain of Prudential Corporation plc's
subsidiaries.


                               Page 7 of 7 pages


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