<PAGE>   1

                                                                    Exhibit 21.1



                         SUBSIDIARIES OF THE REGISTRANT


<TABLE>
<CAPTION>
                                                                    PERCENTAGE
  NAME OF BUSINESS                   JURISDICTION                  OF OWNERSHIP
  ----------------                   ------------                  ------------
<S>                                  <C>                           <C>
 Xenerex Biosciences                  California                       100%
</TABLE>



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