Mitotic proliferation in the bone marrow of female rats and mice kept under standardized coniditions with light from 6:00 a.m. to 6:00 p.m. exhibited a significant circadian periodicity with the greatest activity occurring from 6:00 a.m. to 12:00 noon. The reticulocyte levels in peripheral blood were highest at 8:00 a.m.
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Clark et al. (1969) studied this question.
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