The class II transactivator ( CIITA ) is essential for the expression of major histocompatibility complex ( MHC ) class II antigens .
the class ii transactivator ( ciita ) is essential for the expression of major histocompatibility complex ( mhc ) class ii antigens .
O B-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O