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A new study has detailed how a compound called EP055 binds to sperm proteins to significantly slow the overall mobility of the sperm without affecting hormones, making EP055 a potential "male pill" without side effects. "Simply put, the compound turns-off the sperm's ability to swim, significantly limiting fertilization capabilities," said lead investigator Michael O'Rand from the University of North Carolina. "This makes EP055 an ideal candidate for non-hormonal male contraception."