FB2026_03 , released September 17, 2026
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Term Nebenkern ID (Ontology) FBbt:00004943 (Fly Anatomy)
Definition Mitochondrial mass which is the result of fusion of mitochondria into one structure, found in developing spermatids. At the onion stage, the Nebenkern consists of a densely packed sphere of tightly packed multiple layers of wrapped mitochondrial membranes, that resembles an onion at cross section. At leaf stage, the Nebenkern unfurls to resemble a spear point or leaf blade, and later at comet stage it elongates and splits into two mitochondrial derivatives.[ FlyBase:FBrf0064778 ]
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spermatid
 |__onion stage spermatid____________
anatomical structure                 |
 |__cell component___________________|
male organism                        |
 |__male-specific anatomical entity__|
anatomical entity                    |
 |__male-specific anatomical entity__|
                                     Nebenkern  5 rec.
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Is a cell component
male-specific anatomical entity
Part of onion stage spermatid
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