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Abstract
The ultrastructure of highly abnormal spermatozoa from an infertile man is described. Nearly all cellular elements were completely deranged, and only occasionally a near-normal spermatozoon was found. The defects might be the result of a defective function of the “manchette” and the “spindle shaped body” that occur during spermiogenesis, but disappear during late maturation of the spermatozoon.