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Observational analysis reveals fluctuations in blood components over short and extended periods.
Although the composition of blood is assumed to be constant within narrow limits, fluctuations in concentration of its constituents have been found by many observers over the period of a day or longer. Shaw (1927), Jores (1934) and others describe daily fluctuations in the white corpuscles, and Sabin et al. (1925) found similar changes in the blood platelets.
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E. T. Renbourn (1947) studied this question.
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