however , when the three major growth factors from platelets , ie , platelet-derived growth factor , epidermal growth factor , and transforming growth factor-beta ( pdgf , egf , tgf-beta ) , were independently examined for their growth promoting activity , the former 2 growth factors preferentially stimulated the proliferation of ml and the latter growth factor rather suppressed the growth of both cells .
C0032200
pdgf
C0018284
growth factor