This family includes the N-terminus of the Rab3 GTPase-activating protein non-catalytic subunit. Rab3 GTPase-activating protein is a GTPase activating protein with specificity for Rab3 subfamily [1].

1: Molecular cloning and characterization of the noncatalytic subunit of the Rab3 subfamily-specific GTPase-activating protein. Nagano F, Sasaki T, Fukui K, Asakura T, Imazumi K, Takai Y; J Biol Chem. 1998;273:24781-24785. PMID:9733780