Morphine/BSA is an antigen-adjuvant conjugate that consists of Morphine (吗啡) linked with bovine serum albumin (BSA). By conjugating the antigen with a protein adjuvant, it enhances the production of antigen-specific antibodies in vaccine models. The conjugate does not alter protein folding or disrupt key epitopes, and it enhances cross-presentation and the generation of antigen-specific T cells.