Abstract
Summary
1. Twenty-four hours are required for maturation of the neutrophil from the last division stage in the marrow. 2. The data are best explained by a finite life of 2/3 day for mature neutrophils in marrow, followed by a peripheral life span of 1 to 1 1/3 days. 3. Lymphocytes fall into two classes—medium and large cells, which are rapidly renewed, and small cells, which live at least a week.
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