name: sperm midpiece
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def: "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." [GOC:cjm, MP:0009831]
is_a: GO:0110165 ! cellular anatomical entity
relationship: part_of: GO:0036126 ! sperm flagellum
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