fasciculates with develops from expresses sends synaptic output throughout has sensory dendrite in Ir76a antennal lobe glomerulus VM4 adult antennal lobe commissure antennal olfactory receptor neuron precursor Nba antennal olfactory receptor neuron of coeloconic sensillum adult antennal lobe receptor neuron bilateral antennal lobe receptor neuron adult olfactory receptor neuron Ir76a ac4 2011-11-03T01:56:34Z ORN_VM4 Adult olfactory receptor neuron that expresses the ionotropic receptor (Ir) 76a and the co-receptors Ir76b and Ir25a and has its dendrite in antennal coeloconic sensillum ac4 (Benton et al., 2025). It responds to phenylethylamine, ethylamine and ammonia (Benton et al., 2009; Benton et al., 2025). Its axon innervates antennal lobe glomerulus VM4 bilaterally (Silbering et al., 2011; Benton et al., 2025). It develops from an Nba precursor (Benton et al., 2025). There are approximately 30 of these cells per side in females and 24 in males (Grabe et al., 2016; Benton et al., 2025). ionotropic receptor neuron Ir76a ORN Ir76a Ir76a ac4 ORN (VM4) Note that some Or35a cells (which innervate ac3) also express Ir76a (Benton et al., 2025). ORN ac4C VFB:FBbt_00110018 ionotropic receptor neuron VM4 FlyBrain_NDB:10438 fly_anatomy.ontology ORN ac4X ORN_VM4 DoOR:Ir76a FBbt:00110018 antennal coeloconic sensillum ac4