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We have used the human-sperm/hamster-egg system to compare the frequencies of structural and numerical chromosomal aberrations in 909 sperm karyotypes from four normal healthy men. The frequency of structural aberrations was 1.3, 4.8, 9.0, and 10.4% respectively in the four donors. Certain specific breakpoints were seen twice or even three times in three of the donors. The incidence of aneuploidy was 1.3, 1.4, 1.4, and 1.9%. In three donors the frequencies of structural aberrations were significantly higher in sperm than in lymphocytes from the same man. X-to-Y ratios did not differ significantly from the expected 50:50.
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