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Reorganization of the actin cytoskeleton occurs during apoptosis. We found that actin-binding and Src homology 3 (SH3)-domain-containing proteins cortactin, hematopoietic-specific protein 1 (HS1), and hematopoietic progenitor kinase 1-interacting protein of 55 kDa (HIP-55, also called SH3P7 and Abp1) were degraded in a caspase-dependent manner during apoptosis. Cortactin, HS1, and HIP-55 were direct...