Abstract
A sarcoma was induced in an (A.CA X A.BY)F1 mouse. Two isoantigenic variants were selected by loss of one H-2 antigen. The tumor-associated transplantation antigens (TATA) of these variants were compared as to their specificities in (A.CA X A.BY)F1 mice. Both transplantation and indirect membrane immunfluorescence tests revealed that TATA of both variants did not cross-react. Thus selecting angainst different H-2 antigens also selected different TATA. Karyotype studies suggested that both variants originated from a unique clone.
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