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An improved method for human sperm chromosome preparation is described. Improvements include (1) the use of a sperm population with high motility and normal morphology for insemination, (2) the insemination and postinsemination culture of zona‐free eggs in Holmes medium, which does not require serum supplementation, (3) control of sperm concentration at insemination to avoid heavy polyspermy, (4) reduction of the occurrence of egg agglutination by placing the medium for postinsemination culture in a ring or crescent shape instead of a droplet, and (5) application of a two‐step fixation method to augment the efficiency of chromosome preparation.
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Chaudhuri et al. (1984) studied this question.
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