Spermatogenesis. Testicle. HE (10). Human. 100x. Spermatocytes I in the diplotene stage. Tangential section of the seminiferous epithelium that has affected a group of spermatocytes I in the diplotene stage (D). In this stage, the bivalents are highly condensed, broad, and the so-called chiasms can be seen. They are formed because of the dismantling of the synaptonemic complex between the homologous chromosomes. This causes a slight separation of bivalent, revealing the chiasms (arrowheads), which are observed as small X-images. At the same time, the highly condensed chromosomes, move towards the periphery of the nucleus, leaving a small clear space (asterisk) in the center of the nucleus.
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