when highly purified preparations of the human platelet gp ( g25k ) protein are reconstituted with the purified egf receptor into phospholipid vesicles , an egf-stimulated phosphorylation of the platelet gtp-binding protein occurs with a stoichiometry approaching 2 mol of 32pi incorporated/mol of [ 35s ] gtp gamma s-binding sites .
C0018353
gtp
C0079469
gtp gamma s