Clonal Selection of B Cells: Clonal selection occurs when a B cell with a receptor specific to an antigen proliferates and differentiates into plasma cells for antibody production and memory B cells for long-term immunity.
Clonal Selection and Expansion of T Lymphocytes: When a T lymphocyte binds its specific antigen presented by an APC, it undergoes clonal selection and rapidly divides into effector and memory T cells, amplifying the immune response.