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Basal circulating levels of progesterone, 17 alpha-OH-progesterone, dehydroepiandrosterone, androstenedione, testosterone and oestradiol-17 beta were measured in 'young' (median age 34 years) and 'old' (median age 73 years) normal males between 08.30 and 17.00 h. Diurnal rhythms for 17 alpha-OH-progesterone, dehydroepiandrosterone, androstenedione and testosterone were observed in both young and old men. No rhythms were discernible for progesterone or oestradiol-17 beta in both age groups.
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Murono et al. (1982) studied this question.
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