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|21. Activation of B Cells to Make Antibody|
The B cell uses its antibody-receptor to bind a matching antigen, which it then engulfs and processes. This triggers the B cell to become a large plasma cell producing millions of copies of the same specific antibody. These antibodies then circulate in the bloodstream in search of more matching antigens. B cell antibodies cannot themselves kill an invading organism, but they can use their antibodies to mark invaders for destruction by other immune cells and by complement.