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The Journal of Cell Biology, Vol 87, 280-284, Copyright © 1980 by The Rockefeller University Press

ARTICLES

Electron microscope evidence for the presence of globular structures in different sperm chromatins

M Gusse and P Chevaillier

Dispersion of nuclear fibers of the spermatozoa of dogfish, man, and bull is made possible after treatment with a reducing and alkylating reagent coupled with an anionic detergent; the same detergent used at a low ionic strength dissociates the nuclear content of the rainbow trout sperm. Electron microscopy of such dispersed nuclear fibers has shown a beads-on-a-string configuration for these four types of sperm chromatin. These structures are morphologically similar to those described in somatic cell nuclei as nucleosomes, although in sperm chromatin the basic proteins associated with DNA were significantly different from histones.
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