7. Plasma cells These cells produce antibodies by the millions, which, like guided missiles, then circulate throughout the body.

Many of them become plasma cells. Again, there must be the right receptors on the helper T cells to join up with the B cells and cause them to produce plasma cells. It is those plasma cells that start churning out thousands of antibodies a second.

Since each plasma cell makes only one kind of antibody, with a receptor specific for only one disease antigen, soon billions are on the front lines homing in on the antigens of one specific disease.