title: Comment on the finding of Ia expression in nonlymphoid cells.
mesh_terms: D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology*; D008264:Macrophages / Q000276:immunology
chemical_list: D000949:Histocompatibility Antigens Class II; D007371:Interferon-gamma