FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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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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      53
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       1
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       7
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      26
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Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 cystoblast (all annotations which use CV term, excluding "NOT" statements)      56     14      8     32
     cystoblast | adult stage | increased number | temperature conditional       1       --       --       1
     cystoblast | decreased number       8       --       --       8
     cystoblast | ectopic | germline clone       2       --       --       3
     cystoblast | female       1       --       --       --
     cystoblast | germline clone       2       --       --       --
     cystoblast | heat sensitive       1       --       --       --
     cystoblast | increased number       9       --       --       2
     cystoblast | non-rescuable maternal effect       1       --       1       --
     cystoblast | progressive       3       --       --       2
     cystoblast | third instar larval stage       2       --       --       3
Spanning Tree (Parents/Children)
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germline cell______________________
female-specific anatomical entity__|
                                   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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