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1. Plasma specific activities were measured at various times after the intravenous injection of calcium-47 in four different age groups of rats.2. The data may be represented as two power functions. The change in power function occurs at a set time which is significantly different in three of the age groups.3. Various bones, muscle and skin all show different uptakes of the calcium-47 and the change in the power function of the plasma data probably represents an equilibrium of the soft tissue calcium.
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