The immune system as a whole can be broadly separated into two main branches: the innate immune response and the adaptive immune response. The innate immune response is performed by a system that is always present across the body, while the adaptive immune response appears only in response to an infection and is always specific to a particular infectious agent. B cells are a part of the adaptive immune system.
B cells are one of the two types of lymphocytes, the other kind being T cells. Like most immune cells, B cells have a very specific function: the production of antibodies, which play a major role in immunity. However, in order for a B cell to produce antibodies it must first become activated.
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