The circadian variations in plasma testosterone levels in men (Saxena, Leyendercker, Chen, Gandy & Peterson, 1969) and the suggested circadian-based production of fsh and lh in birds (Murton, Bagshawe & Lofts, 1969), rats (World Health Organization, 1969) and men (Saxena et al., 1969) led us to study the circadian behaviour of two testis enzymes, hexokinase and pyruvate kinase.
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