serum deprivation arrests balb/c-3t3 fibroblasts ( clone a31 ) in g0 phase , where resumption of the cell division cycle can be induced by addition of serum or of specific growth factors in a defined sequence : pdgf ( inducer of a state of `` '' competence , '' '' characterized by the expression of a family of genes including c-myc ) , epidermal growth factor egf and igf1 ( leof et al. , 1982 , 1983 ) .
C0018284
growth factors
C0032200
pdgf