to determine the basis of this heterogeneity , cells from spontaneous tumors and from five subpopulations isolated from a single spontaneous tumor were examined for expression of viral antigens under both conventional conditions and conditions known to induce synthesis of murine mammary tumor virus antigens ( 5-iodo-2'-deoxyuridine and dexamethasone ) .
C0003342
viral antigens
C0003320
antigens