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As rat spermatozoa undergo epididymal maturation, they acquire the ability to exhibit a spontaneous burst of luminol-peroxidase-dependent chemiluminescence when released into a simple, defined culture medium. This activity was suppressed by inhibitors of plasma membrane redox systems such as diphenylene iodonium, p-chloromercuribenzenesulfonic acid, and capsaicin, but was resistant to inhibition by...