FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term EW2 neuron ID (Ontology) FBbt:00001584 (Fly Anatomy)
Definition Serotonergic interneuron of embryonic/larval abdominal segments A1-A7. Its contralateral branch forms a complex pattern at the ventral border of the contralateral neuropil that extends along the lateral margins. Its ipsilateral branch seems to fasciculate with the respective neurite of the serotonergic abdominal medial neuron and follows a similar pathway, though extending a contralateral neurite about mid-level in the dorso-ventral and anterior-posterior axis. This neurite extends a short way anterior along a midline tract. It is born from the second-born ganglion mother cell of the 7-3 lineage (GMC 7-3b).[ FlyBase:FBrf0094581 FlyBase:FBrf0100717 FlyBase:FBrf0138252 FlyBase:FBrf0207378 ]
Also Known As"larval serotonergic abdominal lateral neuron"
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VFB:FBbt_00001584
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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
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 EW2 neuron (all annotations which use CV term, excluding "NOT" statements)
     EW2 neuron | ectopic
      --       --
     EW2 neuron | ectopic | embryonic stage
      --       --       --
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abdominal neuron
 |__larval serotonergic abdominal neuron__
larval serotonergic VNC neuron            |
 |__larval serotonergic abdominal neuron__|
Notch OFF hemilineage primary neuron      |
 |__larval EW neuron______________________|
NB7-3 lineage neuron                      |
 |__larval EW neuron______________________|
larval interneuron                        |
 |__larval EW neuron______________________|
primary interneuron                       |
 |__larval EW neuron______________________|
                                          EW2 neuron  25 rec.
                                           |__larval serotonergic A1 neuron 2
                                           |__larval serotonergic A2 neuron 2
                                           |__larval serotonergic A3 neuron 2
                                           |__larval serotonergic A4 neuron 2
                                           |__larval serotonergic A5 neuron 2
                                           |__larval serotonergic A6 neuron 2
                                           |__larval serotonergic A7 neuron 2
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Is a larval EW neuron
larval serotonergic abdominal neuron
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VFB:FBbt_00001584