cultures of human peripheral blood leukocytes ( pbl ) induced with phytohemagglutinin ( pha ) and the phorbol ester 12-0-tetradecanoylphorbol 13-acetate ( tpa ) produced two types of cytotoxic proteins , indistinguishable in the in vitro assay employing murine l 929 cells as targets .
C0031586
phorbol ester
C0039654
tetradecanoylphorbol