minor histocompatibility antigen

https://doi.org/10.1351/goldbook.13460
Non-major histocompatibility complex (MHC)-encoded cell surface processed peptide which, in association with MHC-encoded molecules, contributes to graft rejection, albeit not usually as severe as that due to MHC mismatch.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1213 [Terms] [Paper]