. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "ctla4_human"^^ . "CD152"^^ . "CTLA4"^^ . "Cytotoxic T-lymphocyte-associated antigen 4"^^ . . . "Cytotoxic T-lymphocyte protein 4"^^ .