1. Pathogens have __antigens______ on their surface that bind to B cells with complementary _phagocyte______.
2. B cells that bind to the pathogen divide, forming __plasma çells______ of identical cells with the same antigen____antibodies_________
3. Some cells of the clone develop into short-lived ___cells_____ that secrete ___antibodies_____ specific for the antigen.
4. Some cells develop into long-lived ___cells_____, which produce larger ___immunology_______ of memory and effector cells upon later exposure to the same antigen.
