The developmental kinetics of antibody-forming cells (AFC) and of cells synthesizing immunoglobulins without detectable antibody function against the antigen injected (IFC) were compared in lymph nodes of normal mice and tolerant mice receiving an immunogenic challenge. Tolerant states to bovine serum albumin (BSA), induced in adult mice, and to human γ-globulin (HGG), induced in newborn mice, were studied. Whatever the tolerant state induced, the following main results were obtained: 1) both AFC and IFC were suppressed in tolerant mice, and this to approximately the same extent for the two populations; 2) both the suppression of the AFC and of the antigen-induced IFC were specific to the tolerogen used.

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