tokens: Ras-GRF1 transiently expressed with v-Src was tyrosine phosphorylated and showed significant GEF activity toward Rac , but not Rho and Cdc42 , which was comparable with that induced by Gbetagamma .
folded_tokens: ras-grf1 transiently express with v-src be tyrosine phosphorylated and show significant gef activity toward rac , but not rho and cdc42 , which be comparable with that induce by gbetagamma .