MHC Class I and II Antigen Presentation
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MHC class I, on nearly all cells, displays internal protein fragments for cytotoxic T cells; MHC class II, on specialized cells, displays engulfed fragments for helper T cells.
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A virus-infected cell's MHC class I display flags it for cytotoxic attention.
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MHC class I and II serve different cells and T cell types, not interchangeable versions of one system.