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Binds differentially to the SH3 domains of certain proteins of signal transduction pathways. This protein binds preferentially to c-Abl proto-oncogene, SRC and GRB2. Shows GAP activity for Rac-related proteins but not for Rho- or Ras-related proteins. It inhibits PDGF-induced membrane ruffling mediated by Rac (By similarity).
