the simple postulates of the model lead to feasible mechanisms for the helper , suppressor and killer roles of t cells , cellular and humoral immune responses , low zone tolerance and the tolerogenic effects of monomers , immune memory , antigenic competition , the abrogation of tolerance with cross-reacting antigens , the usefulness of the switch from igm to igg , and self-tolerance to both serum antigens and cell surface antigens .
C0020963
self-tolerance
C0003320
antigens