FB2026_03 , released September 17, 2026
CV Term Report
Help Close All Open All
General Information
Term adult olfactory receptor neuron Ir76a ac4 ID (Ontology) FBbt:00110018 (Fly Anatomy)
Definition 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).[ FlyBase:FBrf0206496 FlyBase:FBrf0215822 FlyBase:FBrf0233453 FlyBase:FBrf0262710 ]
Also Known As"ionotropic receptor neuron Ir76a" ; "Ir76a ac4" ; "ORN (VM4)" (for all, see Synonyms field below)
CommentNote that some Or35a cells (which innervate ac3) also express Ir76a (Benton et al., 2025).
Links to External Ontologies
VFB:FBbt_00110018
Annotations
Records annotated with this term OR any of its CHILD TERMS

Choose a record type to view annotations for this term and its child terms. Direct annotations and full annotation statements below also provide HitList buttons.

    • Results list data from multiple species. Choose a record type above to open its HitList.
Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Insertions Constructs
 adult olfactory receptor neuron Ir76a ac4 (all annotations which use CV term, excluding "NOT" statements)
Spanning Tree (Parents/Children)
Only view relationship:
Vocabulary search 
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 Ir76a ac4  5 rec.
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a antennal olfactory receptor neuron of coeloconic sensillum
bilateral antennal lobe receptor neuron
Develops from antennal olfactory receptor neuron precursor Nba
Part of
hide Synonyms & Secondary IDs
Synonyms
  • "ionotropic receptor neuron Ir76a" EXACT
    "ionotropic receptor neuron VM4" RELATED
    "Ir76a ac4" EXACT
    "ORN (VM4)" EXACT
    "ORN ac4C" EXACT[ FlyBase:FBrf0250923 ]
    "ORN ac4X" EXACT[ FlyBase:FBrf0226805 ]
    "ORN Ir76a" EXACT
    "ORN_VM4" EXACT VFB_SYMBOL
Secondary IDs
hide External Crossreferences & Linkouts
DoOR:Ir76a
FlyBrain_NDB:10438
VFB:FBbt_00110018