retinoic acid also stimulates colony formation in soft agar induced by the phorbol ester 12-o-tetradecanoylphorbol-13-acetate , although the phorbol ester alone is less effective in producing anchorage-independent growth than is the sarcoma growth factor .
C0039654
12-o-tetradecanoylphorbol-13-acetate
C0031586
phorbol ester