in balb/c3t3 cells , fibroblast growth factor ( 100 ng/ml ) , platelet-derived growth factor ( 5 units/ml ) , and epidermal growth factor ( 40 ng/ml ) stimulated gt mrna accumulation , although , when added individually , none of these growth factors increased dna synthesis .
C0032200
platelet-derived growth factor
C0018284
growth factors