ScerGAL4GMR27E09 drives expression in two type Is motor neurons per hemineuromere, that innervate the A1-7 ventral longitudinal muscle 1, A1-7 ventral longitudinal muscle 2, A1-7 dorsal acute muscle 1, and A1-7 dorsal oblique muscle 1 (muscles 12, 13, 1 and 9).