<prompt> Following injection of lymphokines, the same class of immunoglobulin are produced. This is to be referred as -Clonal selectionHybridisationClass switchingnoe of the above  <response>: B-cells are able to make a specific antibody against a specific antigen. It is due to present of specific receptor on B-cells - B-cell receptor BCR, that is usually an immunoglobulin Ig M or Ig D. An antigen interacts with B-cell that shows best fit by viue of its BCR. The antigen binds to this receptor, and the B-cell is stimulated to divide and form a clone clonal selection. This clone of cells will become plasma cells that will secretes antibody of a paicular specificity and same class. Although, B-cells are the major source of antibodies after their conversion into plasma cells, Helper - T cells are alsoimpoant. Helper T-cells activate B-cells by secreting cytokines lymphokines. o In antibo B-cells are able to make a specific antibody against a specific antigen. It is due to present of specific receptor on B-cells - B-cell receptor BCR, that is usually an immunoglobulin Ig M or Ig D. An antigen interacts with B-cell that shows best fit by viue of its BCR. The antigen binds to this receptor, and the B-cell is stimulated to divide and form a clone clonal selection. dy formation T-cells are involved earlier than B-cells. REF: ROBBINS pathology 10th edition 