This domain is found st the C-terminus of many spine-associated Rap GTPase-activating - SPAR - proteins in eukaryotes. This domain is found associated with Pfam:PF02145, Pfam:PF00595. The exact function is not known.

1: Regulation of dendritic spine morphology by SPAR, a PSD-95-associated RapGAP. Pak DT, Yang S, Rudolph-Correia S, Kim E, Sheng M; Neuron. 2001;31:289-303. PMID:11502259