GTPase-activating protein, which acts as a negative regulator for the member of the Ras family let-60. Probably decreases the signaling activity of Ras by stimulating its intrinsic GTPase activity, thereby lowering the levels of GTP-bound, active Ras. The different isoforms may play a distinct role in specific tissues. Mainly expressed in gonads and vulval cells. Isoform c in expressed in pharyngeal epithelial cells and several rectal/blast cells in the tail region. Isoform f is weakly expressed in four cells symmetrically located in the vulval region. Isoform g is strongly expressed in the pharyngeal muscle cells m6 in addition to several cells in the tail region. Truncated N-terminus. Truncated N-terminus.