RasGAP1-PA Gap 1 gap CG6721-PB GTPase activating protein 1 Gap RasGAP RasGAP1-PC CG6721-PA sextra seven extra GAP Gap1 RasGap1 FBpp0076097 gap1 rasGAP GAP1 GTPase activating protein1 CG6721-PC sxt Ras-GAP more inner photoreceptors GTPase-activating protein 1 rI533 Dmel\CG6721 mip RasGAP1-PB CG6721