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CTLA-4 (CD152) is a regulatory molecule in the immune system fundamentally important for the inhibition of T cell activity that is mediated by an unknown mechanism. Here we demonstrate similarities of CTLA-4 and Itch deficient mice and that CTLA-4 deficient T cells show a massive reduction in the overall ubiquitination of proteins. CTLA-4-mediated signal transduction leads to increased de-phosphorylation...
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