Positive selection is an early event in thymocyte differentiation: high TCR expression by cycling immature thymocytes precedes final maturation by several days.


T cell antigen receptor expression by cycling and post-cycling thymocytes has been analysed by flow cytometry. Normal mice were pulsed with 5-bromo-2'-deoxyuridine (BrdUrd), a thymidine analogue detectable with a monoclonal antibody. Thymocytes were surface-stained with antibodies against several V beta gene products and against whole alpha beta receptors… (More)


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