B cell

B cells are lymphocytes, a type of white blood cell. Once the B cell is activated, it turns into a plasma cell,^[a] and starts producing antibodies. They are a vital part of the adaptive immune system. They have a protein on the B cell's outer surface known as a 'B cell receptor'. This allows a B cell to bind to a specific antigen.

B cell
The cells of the immune system form cells that remember the pathogen for future infections.
Details
Identifiers
Latin	lymphocytus B
MeSH	D001402
FMA	62869
Anatomical terminology [edit on Wikidata]

B cell activation

The main functions of B cells are:

1. to make antibodies against antigens,
2. to perform the role of antigen-presenting cells (APCs),
3. to develop into memory B cells after activation by antigen interaction.

Recently, a new, suppressive function of B cells has been discovered.^[1]

In mammals, immature B cells are formed in the bone marrow, hence their name.^[2]

Note

1. Plasma cell = cell which makes antibodies