Dynamics of specific binding of the antigen with rabbit blood lymphocytes in the process of immunization was studied by radioimmunochemical method with the use of human serum albumin, I125-labeled. Three types of response to the antigenic stimulant were revealed: biphasic with two maximal of the antigen-binding activity -- on the 5th--10th and the 15th--20th day; uniphasic -- with the maximum activity on the 15th--20th day, the absence of increase of the antigen-binding activity of blood lymphocytes and a high mean level of specific antigens; the absence of primary cell reaction to the administration of the antigen and low level of specific antibodies. A correlation was revealed between the intensity of the humoral response and the sum total amount of the immunocompetent lymphocytes entering the circulation in the course of the whole immunization period.
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