further work is needed to determine whether ( i ) production of pdgf by tumor cells confers a proliferative advantage on these cells , ( ii ) tyrosine-specific phosphorylations mediate the induction of cell cycle early genes by pdgf , and ( iii ) products of cell cycle early genes play any functional role in the 10-12 hr chain of events that culminates in replicative dna synthesis and cell division .
C0007634
cells
C0007590
cell division