Antigen-presenting molecule specialized in presenting microbial vitamin B metabolites. Involved in the development and expansion of a small population of T-cells expressing an invariant T-cell receptor alpha chain called mucosal-associated invariant T- cells (MAIT). MAIT lymphocytes are preferentially located in the gut lamina propria and therefore may be involved in monitoring commensal flora or serve as a distress signal. Expression and MAIT cell recognition seem to be ligand-dependent.
Class I histocompatibility antigen-like protein; Major histocompatibility complex class I-related gene protein; major histocompatibility complex, class I-like sequence; MHC class I-like antigen MR-1; MHC class I-related gene protein; MHC class-I related-gene protein