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Dipeptides differ in peptide-exchange dependence on their second hydrophobic residue. A2/β2m/peptide complexes were prepared and incubated with 100 nM exogenous NLVPKFITCVATV plus 10 mM dipeptides as indicated. Left panels show representative experiments. Right panels show kon values (average ± SEM of three or more independent experiments). (A) A2–NLVPMVATA. (B) A2–ILKEPVHGV. Numerical values are shown in Table S1.
