FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term thecogen cell ID (Ontology) FBbt:00005173 (Fly Anatomy)
Definition The eo accessory cell that makes the thecogen dendritic cap - a cuticle-like matrix around the tip of the eo-dendrite and which encloses the soma of the eo-neuron.[ FlyBase:FBrf0049554 FlyBase:FBrf0089570 FlyBase:FBrf0111371 ]
Also Known As "external sensory organ sheath cell" ; "neurilemma cell"
Comment
Links to External Ontologies
VFB:FBbt_00005173
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      66
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       1
Insertions (FBti)  PHENOTYPE_MANIFEST_IN      13
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      15
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 thecogen cell (all annotations which use CV term, excluding "NOT" statements)      67     14      1     15     22
     thecogen cell | ectopic      18       --       --       8      4
     thecogen cell | embryonic stage       5       --       --       1       --
     thecogen cell | heat sensitive       2       --       --       --       2
     thecogen cell | increased number       5       --       --       --       2
     thecogen cell | P-stage       2       --       --       --       1
     thecogen cell | somatic clone      10       --       --       --       1
Spanning Tree (Parents/Children)
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sensory organ cell__
epidermal cell______|
                    eo sensory organ accessory cell
                     |__thecogen cell  119 rec.
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Is a eo sensory organ accessory cell
Develops from external sensory organ precursor cell IIIb
Part of
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Synonyms
Secondary IDs
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CL:0000380
VFB:FBbt_00005173