Abstract
Summary
Circadian fluctuations in the mitotic index of 3 specific cell lines of the bone marrow were studied. The males showed bimodal fluctuations for the dividing granulocytes and one peak with two minima for lymphocytes. Erythroid mitotic indices exhibited a clear cut diurnal variation with peak activity in late afternoon and lowest in early morning. No circadian fluctuations could be ascertained for mitotic indices of bone marrow cells from female mice.
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