The P{EP} element is inserted in reverse orientation within the first intron of the large mRNA isoform.
anterior fascicle & synapse, with Scer\GAL4elav-C155
Mutant larvae expressing scbEP2591 under the control of Scer\GAL4elav-C155 have reduced or abnormal synapses. Mutant larvae expressing scbEP2591 under the control of Scer\GAL4elav-C155 have ISN neuron pathfinding defects.