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Spermiogenesis - late stage

Microimage
Image copyright: University of Oslo, CC BY-NC-ND 4.0.

Her you see part of a spermatozoon, in the process of extruding cytoplasm (residual material). In the upper left corner you see a cross section of a middle piece, with a 9 + 2 microtubular structure in the middle and mitochondria externally.

Published July 29th 2019, updated August 30th 2020.