Abstract:

We used a "hit and run" gene targeting strategy to generate mice expressing only the p41 isoform of the conserved invariant (Ii) chain associated with MHC class II molecules. In contrast to mutants expressing only p31 Ii chain, a small proportion of A(alpha)b A(beta)b molecules produced by these animals have reduced mobilities in SDS-PAGE and appear incompletely processed. Nonetheless, class II surface expression, peptide occupancy, CD4+ T cell maturation, and proliferative responses toward i...

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