Fig. 4
From: The role of ubiquitin-conjugating enzyme in the process of spermatogenesis
The main process of spermiogenesis with the transformations of histones to protamine. Round spermatids undergo 16 steps to generate normal elongated sperm. Golgi apparatus gradually form sperm acrosome. Sperm flagellum gradually is elongated with microtubule proteins and rearrangement of mitochondria. Redundant cytoplasm was removed at last, and Ube2j1 plays an indispensable role in this process. We only show 5 stages of spermatids to present this procedure following the transformations of histones to protamine, for which Ube2b is crucial