exposure of polyoma virus-transformed fibroblasts to the protein kinase c-stimulating phorbol ester 12-o-tetradecanoyl phorbol-13-acetate ( tpa ) is known to increase the transforming potential of the virus 's middle t antigen .
C0031586
phorbol ester
C0039654
12-o-tetradecanoyl phorbol-13-acetate