1, it can be seen that the frequency of PHA responsive units is 1 per 1,400 mononuclear cells from young persons and 1 per 2,950 mononuclear cells from old persons, and it is clear that the difference is highly significant.
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Immunological studies of Aging. III. Cytokinetic basis for the impaired response of lymphocytes from aged humans to plant lectins.
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