FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term primary spermatocyte ID (Ontology) FBbt:00005286 (Fly Anatomy)
Definition Male germ cells of the 16-cell cyst from the end of the S-phase that precedes meiosis I to the end of meiosis I. This S-phase occurs very early in the 16-cell cyst stage so almost all 16 cell cysts are at the primary spermatocyte stage.[ FlyBase:FBrf0064778 ]
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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
 primary spermatocyte (all annotations which use CV term, excluding "NOT" statements)
     primary spermatocyte | ectopic
      --       --       --
     primary spermatocyte | male
      --       --       --       --
     primary spermatocyte | P-stage
      --       --
      --
     primary spermatocyte | spermatogenesis
      --       --
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spermatocyte cyst
 |__spermatocyte_______________
 |__primary spermatocyte cyst  |
male germline cell             |
 |__spermatocyte_______________|
                               primary spermatocyte  191 rec.
                               primary spermatocyte cyst(+) 268 rec.
                                |__primary spermatocyte  191 rec.
                                |__apolar primary spermatocyte
                                |__mature primary spermatocyte 7 rec.
                                |__meiotic primary spermatocyte 12 rec.
                                |   |__primary spermatocyte in meiotic anaphase I 4 rec.
                                |   |__primary spermatocyte in meiotic metaphase I
                                |   |__primary spermatocyte in meiotic prophase I 4 rec.
                                |   |__primary spermatocyte in meiotic telophase I 3 rec.
                                |__polar primary spermatocyte 18 rec.
                                    |__apolar primary spermatocyte
                                    |__mature primary spermatocyte 7 rec.
                                    |__meiotic primary spermatocyte 12 rec.
                                    |   |__primary spermatocyte in meiotic anaphase I 4 rec.
                                    |   |__primary spermatocyte in meiotic metaphase I
                                    |   |__primary spermatocyte in meiotic prophase I 4 rec.
                                    |   |__primary spermatocyte in meiotic telophase I 3 rec.
                                    |__polar primary spermatocyte 18 rec.
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Is a spermatocyte
Part of primary spermatocyte cyst
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