FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term adult olfactory receptor neuron Ir84a ID (Ontology) FBbt:00110007 (Fly Anatomy)
Definition Adult olfactory receptor neuron that expresses the Ionotropic receptor (Ir) 84a and the co-receptor Ir8a (Benton et al., 2025). Its dendrite transduces signals from the antennal coeloconic sensillum ac4 (Benton et al., 2009). It responds to phenylacetic acid and phenylacetaldehyde (Benton et al., 2025). Its axon innervates antennal lobe glomerulus VL2a bilaterally, following the antennal lobe commissure (Grosjean et al., 2011; Silbering et al., 2011). It develops from an Nab precursor (Benton et al., 2025). There are around 30 of these cells on each side in females and 24 in males (Grabe et al., 2016).[ FlyBase:FBrf0206496 FlyBase:FBrf0215822 FlyBase:FBrf0216424 FlyBase:FBrf0233453 FlyBase:FBrf0262710 ]
Also Known As "ionotropic receptor neuron Ir84a" ; "Ir84a ac4" ; "ORN (VL2a)" (for all, see Synonyms field below)
Comment This neuron was indirectly shown to be olfactory by electrophysiological recordings of a single coeloconic sensillum (Grosjean et al., 2011).
Links to External Ontologies
VFB:FBbt_00110007
Annotations
Records annotated with this term OR any of its CHILD TERMS
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Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       8
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION      13
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       2
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       7
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Relevant FlyBase reports
 Alleles Insertions Constructs
 adult olfactory receptor neuron Ir84a (all annotations which use CV term, excluding "NOT" statements)       9     15     10
     adult olfactory receptor neuron Ir84a | somatic clone       3      1      1
     adult olfactory receptor neuron Ir84a | somatic clone - tissue specific       2       --       4
Spanning Tree (Parents/Children)
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eo neuron
 |__antennal olfactory receptor neuron of coeloconic sensillum__
adult antennal olfactory receptor neuron                        |
 |__antennal olfactory receptor neuron of coeloconic sensillum__|
adult antennal lobe receptor neuron                             |
 |__bilateral antennal lobe receptor neuron_____________________|
                                                                adult olfactory receptor neuron Ir84a  34 rec.
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Is a antennal olfactory receptor neuron of coeloconic sensillum
bilateral antennal lobe receptor neuron
Develops from antennal olfactory receptor neuron precursor Nab
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Synonyms
Secondary IDs
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DoOR:Ir84a
FlyBrain_NDB:10435
VFB:FBbt_00110007