FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term U neuron ID (Ontology) FBbt:00001564 (Fly Anatomy)
Definition Larval motor neuron that is generated by neuroblast NB7-1, innervates a dorsal or lateral muscle and expresses eve (Cleary and Doe, 2006; Seroka et al., 2020). It is the Notch ON progeny of its ganglion mother cell (Seroka et al., 2020). There are five subtypes, each fasciculating with the intersegmental nerve and terminating on a different muscle according to birth order, with earlier born neurons terminating more distally (Meng et al., 2019).[ FlyBase:FBrf0102831 FlyBase:FBrf0190540 FlyBase:FBrf0241992 FlyBase:FBrf0243538 FlyBase:FBrf0246311 ]
Also Known As"U motor neuron"
Comment
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VFB:FBbt_00001564
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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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 Full annotation statements 
Relevant FlyBase reports
 Alleles Split System Combinations Genes Insertions Constructs
 U neuron (all annotations which use CV term, excluding "NOT" statements)
     U neuron | decreased number | embryonic stage
      --       --       --
     U neuron | ectopic
      --       --       --
     U neuron | ectopic | embryonic stage
      --       --       --
     U neuron | ectopic | germline clone
      --       --       --       --
     U neuron | ectopic | heat sensitive
      --       --       --
     U neuron | ectopic | larval stage
      --       --       --
     U neuron | embryonic stage
      --       --       --
     U neuron | embryonic stage 13
      --       --       --
     U neuron | embryonic stage | increased number
      --       --
     U neuron | increased number
      --       --       --
     U neuron | larval stage | somatic clone
      --       --       --
     U neuron | somatic clone
      --       --
      --
Spanning Tree (Parents/Children)
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Vocabulary search 
Notch ON hemilineage primary neuron
 |__NB7-1 Notch ON hemilineage primary neuron__
NB7-1 lineage primary neuron                   |
 |__lineage NB7-1 primary motor neuron_________|
 |__NB7-1 Notch ON hemilineage primary neuron__|
larval efferent neuron                         |
 |__embryonic/larval motor neuron______________|
primary motor neuron                           |
 |__lineage NB7-1 primary motor neuron_________|
 |__embryonic/larval motor neuron______________|
                                               U neuron  181 rec.
                                                |__larval DA2 motor neuron 30 rec.
                                                |   |__larval A1-7-innervating DA2 motor neuron(+) 2 rec.
                                                |__larval DA3 motor neuron 22 rec.
                                                |   |__larval A1-7-innervating DA3 motor neuron(+) 1 rec.
                                                |__larval DO1 motor neuron 28 rec.
                                                |   |__larval A1-7-innervating DO1 motor neuron(+) 2 rec.
                                                |__larval DO2 motor neuron 26 rec.
                                                |   |__larval A1-7-innervating DO2 motor neuron(+) 1 rec.
                                                |__larval LL1 motor neuron 39 rec.
                                                    |__larval A1-7-innervating LL1 motor neuron(+) 6 rec.
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Is a lineage NB7-1 primary motor neuron
embryonic/larval motor neuron
NB7-1 Notch ON hemilineage primary neuron
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VFB:FBbt_00001564