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The nebenkern is a mitochondrion formation in the sperm of some insects such as Drosophila. After the completion of meiosis, spermatid mitochondria wrap around each other to form a spherical aggregate, adjacent to the cell nucleus. The nebenkern proceeds to elongate into a double-stranded helical structure. During flagellum elongation the nebenkern unfolds and the two derivatives (major and minor mitochondrial derivatives) elongate down the bundle of that constitute the axoneme of the flagellum.
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