develops from proximal medullary amacrine neuron proximal medullary amacrine neuron Pm2 Neurotransmitter determined to be glutamate based on vGlut[CNSIII]-GAL4 driver (FBti0129148) expression (Raghu and Borst, 2011 - FBrf0213690), but scRNAseq data assigns as GABA based on Gad1 transcripts and lineage (Konstantinides et al., 2022 - FBrf0253187). Nern et al. (2025) - FBrf0262545 identify two subtypes (Pm2a and Pm2b) in the EM data, but do not distinguish these at light level. Pm2 fly_anatomy.ontology Pm08 FBbt:00003835 Pm03 Pm2 VFB:FBbt_00003835 Proximal medullary wide-field amacrine neuron that projects along M7 and branches extensively at the M7/M8 boundary with each branch projecting into medulla layer M9 where it forms an arbor with mixed bleb-type and fine terminals (Morante and Desplan, 2008; Fischbach and Dittrich, 1989). anterior ectoderm derivative Notch OFF hemilineage secondary neuron immature proximal medullary amacrine neuron Pm2 optic lobe wide-field columnar neuron