part of capable of expresses sends synaptic output throughout Ir21a antennal lobe glomerulus VP3 neuron of aristal sensillum aristal sensory neuron VP3 cold aristal neuron cooling cell TRN_VP3 aristal neuron (VP3) fly_anatomy.ontology FlyBrain_NDB:10368 cool cell cool thermoreceptor cells in the arista Adult unilateral thermosensory neuron with its sensory dendrite in an aristal sensillum and an axonal projection to antennal lobe glomerulus VP3 (Stocker et al., 1990; Alpert et al., 2020; Benton et al., 2025). It has large, elaborate sensory endings (Budelli et al., 2019). It is transiently activated by temperature decreases and transiently inhibited by temperature increases (Budelli et al., 2019). It expresses the cooling-specific Ir21a and the co-receptors Ir25a and Ir93a, with all three being required for sensitivity to cooling (Budelli et al., 2019). There are around 3-4 of these cells per hemisphere (Marin et al., 2020). FBbt:00007576 VP3RNa TRN_VP3 VFB:FBbt_00007576 cold cell ArA cool aristal neuron adult antennal lobe receptor neuron unilateral antennal lobe receptor neuron detection of temperature stimulus sensory perception of cold stimulus