the growth-promoting activity of eif can be differentiated from that of platelet-derived growth factor ( pdgf ) , biologically ( on the basis of differential response of cell lines to both factors ) , biochemically ( on the basis of differences in isoelectric points and mol . wts . and the requirement of eif to become activated by a ph shock ) and by the lack of inhibition of eif by antibody to pdgf .
C0007589
differentiated
C0007634
cell