FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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Term major mitochondrial derivative ID (Ontology) FBbt:00004952 (Fly Anatomy)
Definition Bigger mitochondrial derivative that develops from mid elongation spermatid stage onwards. It initially lies at a 90 degrees angle to a plane that splits the central pair of axoneme microtubules. This decreases gradually to 60 degrees during elongation, returning to 90 degrees during the later stages of spermatid differentiation. Late in the elongation stage, there is a deposition of a paracrystalline array of densely staining granules closely juxtaposed to the axonemal sheath.[ FlyBase:FBrf0064778 ]
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anatomical structure
 |__cell component___________________
anatomical entity                    |
 |__male-specific anatomical entity__|
                                     major mitochondrial derivative
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Is a cell component
male-specific anatomical entity
Part of Nebenkern derivative
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