Relative binding capacity of various Cys-containing CTL epitopes to A*02:01 under conditions to mitigate potential effects of oxidation. Native peptides, or analogs with Cys residues substituted to AABA, were tested under normal conditions, in the absence of protease inhibitors, or in the presence of 2-ME. The top bar in each group represents normal, the middle bar in each group represents no protease inhibitor, and the bottom bar in each group represents 2-ME.