The line repre- sents the linear regressionof log radioactivity on interval after injection---a regressionthat was highly significant.Only the two micekilled 16 hr after injection departed greatly from values predicted by the regressionline; therefore it is suspected that they wereinjected, by error, with lessthan 100#c 35sulfate. added to homogenate from an uninjected mouse, all appeared in the second peak, showing no indication of adhering to macromolecular substances.
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Incorporation of sulfate by the mouse thymus: its relation to secretion by medullary epithelial cells and to thymic lymphopoiesis.
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