Evidence for the involvement of β-endorphin in the human menstrual cycle*†*Supported in part by Grant RR 05390-20 and Contract 1-HD-6-2823 from the National Institutes of Health, Bethesda, Maryland.†Presented at the Thirty-Eighth Annual Meeting of The American Fertility Society, March 20 to 24, 1982, Las Vegas, Nevada. The Associate Members Prize Paper.

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