Abstract
AN alkali-soluble protein fraction, obtained from calf thymus nuclei, was reported by Mayer and Gulick1. Upon addition of acid to the alkaline solution, precipitation of this fraction occurred at about pH 6. Stedman and Stedman2,3 obtained an alkali-soluble protein fraction, ‘chromosomin’, from several kinds of nuclei, including the heads of fish spermatozoa. Alkali-soluble protein fractions, which are precipitated when the solution is made acid, were recently reported to be present in boar spermatozoa4.
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