Differences in the exposure of spermatozoa surface components during epididymal passage have been examined using lactoperoxidase‐catalyzed 125 I‐iodination or labeling with 125 I‐diazodiiodosulfanilic acid. Labeled surface proteins obtained from caput and cauda epididymides were solubilized in detergent, separated by sodium dodecylsulfate polyacrylamide slab gel electrophoresis, and identified by radiography. Densitometer scans of autoradiograms revealed increased amounts or exposures of surface proteins of ∼35,000, ∼39,000, ∼50,000, and ∼78,000 molecular weight on the cauda epididymal spermatozoa.
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Nicolson et al. (1979) studied this question.
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