Discovery of the mechanism for V(D)J hypermutation remains a basic goal of immunology despite the best efforts of many labo- ratories. The existence of catalyzed, site-specific mutation and its exploitation for the somatic evolution of lymphocytes are re- markable adaptations, yet since the discovery of hypermutation in 1970 (see cover), much hard work has generated little. Indeed, our knowledge of what is probably absolutely required for the mutator's action can be succinctly expressed: /g gene enhancers. Table 1 of Winter et a .'s chapter puts into a historical perspec- tive how our notions...