Direct Evidence for a Bone Marrow Origin of the Alveolar Macrophage in Man

Abstract
Alveolar macrophages were obtained from 23 patients who had received marrow transplants for hematologic disorders. The presence of a Y body in macrophages of male origin was demonstrated by fluorescence microscopy. In those patients with a marrow donor of opposite sex the alveolar macrophages were shown to be of donor origin. The disappearance with time of host macrophages indicates a life-span, under the conditions, of approximately 81 days.

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