GTPase-activating protein for Rho family members (PubMed:8537347). May interact with RASA1/p120GAP. Also membrane-associated in a fibrillar pattern that colocalizes with the alpha5-beta1 integrin receptor (ITGA5/ITGB1) for fibronectin. Detected in skin fibroblasts (at protein level) (PubMed:8537347). The pG1 pseudoGTPase domain does not bind GTP. Contaminating sequence. Potential poly-A sequence.