Abstract
Human T cell subpopulations (Tμ and Tγ) were examined for their distribution in the peripheral blood, cord blood, bone marrow, tonsils, thymus, lymph nodes and spleen. The proportions of Tμ and Tγ cells are comparable in the peripheral blood, tonsils and bone marrow. The proportions of Tγ cells in cord blood are significantly higher than those in the peripheral blood. Almost complete lack of Tγ cells was observed in lymph nodes. Spleen has very high proportions of Tγ cells. Thymuses have very low proportions of both Tμ and Tγ cells when compared with peripheral blood, cord blood, tonsils, and bone marrow. The receptors for IgM on Tμ cells appear to be masked by passively absorbed IgM and require prior in vitro incubation in medium containing fetal calf serum for the full expression of this marker.
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