Summary
β-Endorphin was estimated in normozoospermic, oligozoospermic and azoospermic human semen. The mean amount in normozoospermic specimens was 278.6±43.6 (SE) pg/ml while in the others only 191.1±25 pg/ml. Both values are significantly higher than those present in the blood.
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Singer, R., Bruchis, S., Barnet, M. et al. β-Endorphin in normozoospermic and pathologic human semen. Experientia 41, 64–65 (1985). https://doi.org/10.1007/BF02005876
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DOI: https://doi.org/10.1007/BF02005876