1. An affinity for iodine, as manifested by some leukocytes in certain conditions. When treated with a solution of iodine and potassium iodide, normal polymorphonuclear leukocytes stain a fairly bright yellow; in certain pathologic conditions the polymorphonuclear leukocytes frequently stain diffusely brown or yellow-brown; the reaction may be intracellular (as described) or extracellular, affecting the particles in the immediate vicinity of the leukocytes.
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