[Effect of B-activin on the rosette-forming capacity of mouse lymphocytes at the peak of a secondary immune response to ram erythrocytes].

The effect of B-activin secreted by bone-marrow cells in response to the expression of antigen-recognizing receptors at the peak of immune response to SRBC was studied. A negative correlation between the number of immune RFC and antibody-producing cells under the influence of B-activin was established. It was shown that the decrease in the number of immune RFC was the result of precommitted B-lymphocyte maturation into plasmatic cells.