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BACKGROUND Opioid receptors and endogenous opioid peptides act not only in the control of nociceptive pathways, indeed several reports demonstrate the effects of opiates on sperm cell motility and(More)
We describe a fast and simple method to monitor variations of intracytoplasmic calcium concentrations in very small and motile cells such as mammalian spermatozoa during measurement time. The method(More)