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| Term | sperm midpiece | ID (Ontology) | GO:0097225 (Gene Ontology) |
| Definition | The highly organized segment of the sperm flagellum which begins at the connecting piece and is characterized by the presence of 9 outer dense fibers (ODFs) that lie outside each of the 9 outer axonemal microtubule doublets and by a sheath of mitochondria that encloses the ODFs and the axoneme; the midpiece terminates about one-fourth of the way down the sperm flagellum at the annulus, which marks the beginning of the principal piece. | ||
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cellular_component |__cellular anatomical structure__ 9+2 motile cilium | |__sperm flagellum________________| sperm midpiece |__sperm mitochondrial sheath |
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| Is a | cellular anatomical structure | ||
| Part of | sperm flagellum | ||
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