FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term cystoblast ID (Ontology) FBbt:00004876 (Fly Anatomy)
Definition Female germline cell which is the daughter of a female germline stem cell. It is found in region 1 of the germarium. It divides four times to give rise to 16 daughter cyst cells, which together form a germline cyst. Division is through a cleavage-like process, with the daughter cells being smaller than the parent cystoblast.[ FlyBase:FBrf0064777 ]
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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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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 cystoblast (all annotations which use CV term, excluding "NOT" statements)
     cystoblast | adult stage | increased number | temperature conditional
      --       --
     cystoblast | decreased number
      --       --
     cystoblast | ectopic | germline clone
      --       --
     cystoblast | female
      --       --       --
     cystoblast | germline clone
      --       --       --
     cystoblast | heat sensitive
      --       --       --
     cystoblast | increased number
      --       --
     cystoblast | non-rescuable maternal effect
      --
      --
     cystoblast | progressive
      --       --
     cystoblast | third instar larval stage
      --       --
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germline cell
 |__female germline cell___________
ovariole                           |
 |__germarium______________________|
multi-tissue structure             |
 |__germarium______________________|
female-specific anatomical entity  |
 |__germarium______________________|
 |__female germline cell___________|
                                   cystoblast  110 rec.
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Is a female germline cell
Develops from female germline stem cell
Part of germarium
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