Penicillin/BSA is an antigen-adjuvant conjugate of Penicillin (青霉素) with Bovine Serum Albumin (BSA). By conjugating the antigen with a protein adjuvant, this compound enhances specific antibody production in vaccine models. The conjugate does not affect protein folding or destroy primary epitopes, and it also boosts cross-presentation and the generation of antigen-specific T cells.