The lack of specific T-cell help in immune responses to thymus-independent antigens results in weak predominantly immunoglobulin M-mediated immunity with little or no memory. (LPS) whereas TI-2 antigens such as bacterial capsular polysaccharides activate via multiple epitopes which cross-link the B-cell receptor. The CD40 antigen is usually constitutively expressed on mature B cells (2) and… Continue reading The lack of specific T-cell help in immune responses to thymus-independent