Late Acting T Cell Depression of High Avidity IgG Antibody Secretion in the Secondary Response

Abstract
Activated T lymphocytes (ATC) suppressed the expression of high avidity plaque-forming cells (PFC) in the secondary immune response when given in vivo 1 day before assay or when mixed in vitro with hyperimmune cells for 90 min before assay. This late acting suppression is a cell dose-dependent, carrier-specific, T cell-mediated phenomenon. The target of this activity is probably the antibody-secreting cell.

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