Tags: Anatomical Structure.

B cells or B lymphocytes are a type of lymphocyte in the humoral immunity of the adaptive immune system. B cells can be distinguished from other lymphocytes such as T cells and natural killer cells (NK cells) by the presence of a protein on the B cells outer surface known as a B cell receptor (BCR). This specialized receptor protein allows a B cell to bind to a specific antigen. In birds B cells mature in the bursa of Fabricius.

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