HRN_VP1l [FBbt_00111336]

HRN_VP1l

ID: FBbt_00111336

Thermosensory receptor neuron that expresses the Ionotropic receptor (Ir) 21a and innervates antennal lobe glomerulus VP1l (Marin et al., 2020; Alpert et al., 2020). It has its sensory dendrite in chamber I of the sacculus and it responds to temperature drops below 25 degrees celsius (Marin et al., 2020; Alpert et al., 2020). It develops from an Naa precursor (Benton et al., 2025). There are around 6-8 of these cells per hemisphere (Marin et al., 2020) and they are unilateral (Schlegel et al., 2021).

Ir21a neuron of sacculus in original reference was speculatively assigned to sacculus chamber III and VP3 (Silbering et al., 2011). Later found to be chamber I and VP1l (Marin et al., 2020 and refs therein). Assigned to 'cold glomerulus' in Alpert et al. (2020) - FBrf0246007, but projections in AL look like VP1l projections shown in Marin et al. (2020).