The binding of an antigen receptor to its specific antigen initiates events that activate the lymphocyte. Activated B cells and T cells amplify the response by dividing many times, forming two types of clones: __ + __.
__, which are short-lived, attack the antigen and any pathogens producing that antigen.
__, which are long-lived but less numerous, bear receptors specific for the antigen.
effector cells and memory cells x2