treatment of human peripheral blood mononuclear cells with uvb light , the photosensitizing system 8-methoxypsoralen plus uva light ( puva ) , or hematoporphyrin derivative plus visible light leads to an inhibition of their stimulatory capacity in an allogeneic mixed leukocyte reaction despite unaltered expression of hla-dr antigens when tested immediately after irradiation .
C0086418
human
C0019764
hla-dr antigens