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. 2001 May 14;153(4):637–648. doi: 10.1083/jcb.153.4.637

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© 2001 The Rockefeller University Press

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

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Abnormal spermatids observed in living asp mutant testes. (A) Two regular spermatids showing nuclei (white circles) and Nebenkern (dark circles) of similar sizes. (B) An abnormal spermatid with the nucleus smaller than the Nebenkern. (C and D) Spermatids with two nuclei of similar sizes (C) or of different sizes (D) associated with a single Nebenkern, which is twice the size of a normal Nebenkern. (E and F) Abnormal spermatids containing four equally sized (E) or differently sized (F) nuclei associated with only one Nebenkern that is four times larger than a regular Nebenkern. (G) A spermatid containing only one abnormally large Nebenkern associated with multiple nuclei. Bar, 10 μm.