FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term mature primary spermatocyte ID (Ontology) FBbt:00057169 (Fly Anatomy)
Definition Late, fully grown primary spermatocyte with a large central nucleus, blocky in appearance, often with indentations or grooves, containing Y-loops and a prominent nucleolus. The second nuclear membrane is fully formed. It has a highly developed endoplasmic reticulum, with mitochondria between the cisternae.[ FlyBase:FBrf0064778 ]
Also Known As "apolar spermatocyte"
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Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       1
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 Alleles Genes Constructs
 mature primary spermatocyte (all annotations which use CV term, excluding "NOT" statements)       1      4      2
     mature primary spermatocyte | third instar larval stage       1       --       --
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  spermatocyte
   |__primary spermatocyte
       |__mature primary spermatocyte  7 rec.
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Is a primary spermatocyte
Develops from apolar primary spermatocyte
Part of mature primary spermatocyte cyst
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