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A mouse mAb, CT-3, recognizes on chicken T cells a complex of three polypeptides, Mr 20,000, 19,000, and 17,000, two of which are N-glycosylated. The CT-3 antibody is mitogenic for chicken T cells, and it coprecipitates two additional polypeptides of Mr 49,000 and 38,000 in lysates of T cell membranes. Ontogeny studies revealed that 5-6 d after thymic influx of hemopoietic stem cells, their thymocyte progeny begin to express the T3/TCR complex. After hatching 1 wk later, the CT-3+ cells begin splenic migration in large numbers.
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Chen et al. (1986) studied this question.
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