Enables GTPase activator activity and SH3 domain binding activity. Acts upstream of or within small GTPase mediated signal transduction. Located in lamellipodium. Is expressed in several structures, including 1st branchial arch; central nervous system; heart; retina layer; and surface ectoderm. Human ortholog(s) of this gene implicated in Adams-Oliver syndrome. Orthologous to human ARHGAP31 (Rho GTPase activating protein 31). [provided by Alliance of Genome Resources, Apr 2022]