May be specifically involved in neuronal and hepatic functions. Is a C3 toxin-insensitive member of the Rho subfamily (By similarity). Interacts with the Rho-GAP domain of RACGAP1. Interacts with UBXD5. Interacts with PRAG1 (By similarity). Colocalizes with RACGAP1 in Golgi-derived proacrosomal vesicles and the acrosome. Expressed specifically in neurons in the brain and spinal cord and also in hepatic stellate cells. Belongs to the small GTPase superfamily. Rho family.