FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term Nebenkern derivative ID (Ontology) FBbt:00004951 (Fly Anatomy)
Definition Structure that develops from the Nebenkern during spermatid elongation. During late onion stage, the Nebenkern begins to unfurl and elongate. At comet stage it splits into two mitochondrial derivatives, which elongate and become unequal in size during mid elongation stage. The mitochondrial derivatives assume a characteristic position to a plane that splits the central pair of axoneme microtubules which changes slightly through elongation.[ FlyBase:FBrf0064778 ]
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Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      29
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       8
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 Alleles Insertions
 Nebenkern derivative (all annotations which use CV term, excluding "NOT" statements)      29      8
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anatomical structure
 |__cell component___________________
anatomical entity                    |
 |__male-specific anatomical entity__|
                                     Nebenkern derivative  37 rec.
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Is a cell component
male-specific anatomical entity
Develops from Nebenkern
Part of axial complex
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