The responses of mature T cells are not necessarily antagonized by their positively selecting peptide.

Abstract excerpt

Transgenic mice have been produced in which all detectable MHC class II proteins, IAb, are bound to a single peptide. Hence, all of the CD4+ class II-restricted T cells in these animals are positively selected in the thymus by reaction with this single class II/peptide combination. It has been suggested that the peptide involved in positive selection of a particular T cell might antagonize the responses of that T...

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