Term Name:	peptide antigen
Synonyms:	antigenic peptide
Definition:	Any peptide displayed by major histocompatibility (MHC) molecules on antigen-presenting cells. Class I MHC accommodate 8 to 13-residue peptides whereas class II MHC can bind 10 to 30-residue peptides, the optimal size being 12 to 16 residues.
Ontology:	ChEBI [CHEBI:166824]  ( EBI )