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Quantitation of the degree of apoptosis in cells restimulated with RT1.Duβ2 (a) alone or in the presence or absence of (b) HLA-DQA1 peptide (100 μg/ml) or (c) HLA-DQB1 peptide (100 μg/ml) at 24 h. Addition of HLA-DQA1 peptide resulted in a significant increase in apoptosis relative to controls and compared with that seen after 1 h.
