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Fig. 4. The actin-binding ability of SWAP-70 through the C-terminal region is crucial for membrane ruffling induced by EGF. (A) COS7 cells expressing GFP or GFPSWAP-70(1-564) were treated with (+) or without () EGF (100 ng/ml) for 5 minutes and stained with Phalloidin to detect F-actin. Localization of SWAP-70 (green) and F-actin (red) was observed under the confocal microscope. Stacked images are indicated by `S', and dorsal planes of focus by `D'. Membrane ruffles are indicated by arrowheads. Bar, 20 µm. (B) COS7 cells expressing GFP or GFPSWAP-70(1-564) were treated with EGF (100 ng/ml) for 5 minutes and stained with Phalloidin to detect F-actin. Ruffling formation was quantified by scores defined in the Materials and Methods.