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B cell

B cells (abbreviated "B" for the bursa of Fabricius, an organ uniqe to birds where B cells mature; the "B" does not stand for bone marrow, where they are created in all other vertebrates) are lymphocytes that play a large role in the primary immune response.

There are two types of B cells:

Humoral immunity (the creation of antibodies that circulate in blood plasma and lymph) involves B cell activation.