B cell

:  any of the lymphocytes that have antigen-binding antibody molecules on the surface, that comprise the antibody-secreting plasma cells when mature, and that in mammals differentiate in the bone marrow :  b lymphocyte The glycoproteins produced by B cells, called antibodies or immunoglobulins, recognize and bind free antigens and are responsible for humoral immunity … — Haruo Saito et al. … helper T cells that induce the proliferation of the antibody-producing B cells. — N. A. Mitchison … patients have no mature B cells circulating in the bloodstream and no antibodies to fight off infections. — Jean Marx — compare t cell