Ras-related C3 botulinum toxin substrate 1 (Rac1; EC 3.6.5.2) is a small (~21 kDa) signaling G protein (more specifically a GTPase), and a member of the Rac subfamily of the small monomeric Ras homolog (Rho) family of GTPases. Members of the Rho family, including Rho, Rac, and Cdc42, control the assembly and organization of the actin cytoskeleton in mammalian cells. They mediate diverse biological processes, including neuronal morphogenesis, tumor invasion, and bone formation, and act in a coordinated manner to modulate cellular functions[1].

RAS GTPases listed: HRAS, Rab7, Rac