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G2A-induced stress fiber assembly requires Gα13. The indicated MEFs were microinjected with pEXV3 G2A.GFP, fixed 4 h later, and stained with rhodamine-conjugated phalloidin. (Upper) GFP fluorescence. (Lower) Phalloidin-stained actin. Arrows indicate injected cells. (Bar = 50 μm.)
