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Formation of riboflavin based MAIT antigens. (A) Riboflavin biosynthesis pathway. (B) The riboflavin biosynthesis intermediate 5-A-RU non-enzymatically reacts with small metabolites to form pyrimidine antigens 5-OP-RU and 5-OE-RU. These can be captured by MR1, or alternatively cyclize to form lumazines, some of which are also weakly antigenic [modified from (11)].
