White blood cells or lymphocytes that mature in the bone marrow (hence B-cells) before being released into the bloodstream where they form part of the body’s immune system response to pathogens and other foreign invaders.

They play a central role in the adaptive immune response in that they produce antibodies that are involved in fighting off infection by destroying invading pathogens and other substances.


Immune System Infectious Disease Vaccines


AntibodyImmune systemPathogen