Cellular Sites of Immunologic Unresponsiveness

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Abstract
The reconstitution of the immune response of lethally irradiated mice to human gamma-globulin is dependent on the synergistic action of bone marrow with thymus cells. Immunologic unresponsiveness appears to involve a functional defect at each of these cellular levels, inasmuch as neither bone marrow nor thymus cells from unresponsive donors are capable of demonstrating synergism in combination with their normal counterpart.