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The literature concerned with the types of cells that participate in the humoral and cell-mediated immune response has been reviewed. It is postulated that the initial cells that are involved in mediating both types of immunity are functionally identical in that both are antigen-reactive cells. In the case of the humoral immune response, the interaction of the antigen-reactive cells with the antigen leads to the release or transfer of "information" to the antibody-forming cell, resulting in the synthesis and secretion of antibody molecules. In the case of cell-mediated immunity, it is considered that the primitive antigen-reactive cell itself transforms into the sensitized cell which infiltrates the site of antigen administration.

proceedings of the national academy of sciences of the united states of america

CELLS INVOLVED IN CELL-MEDIATED AND TRANSPLANTATION IMMUNITY, II. A CONSIDERATION OF THE FUNCTIONAL IDENTITY OF THE CELLS INVOLVED IN BOTH HUMORAL AND CELL-MEDIATED IMMUNITY: A PHYLOGENETIC APPROACH