Short description
B cells are the only cells of the immune systems capable of producing antibodies.
B lymphocytes

Detailed description

B cells are white blood cells. Together with T cells they account for the adaptive component of the immune system, meaning the part that can adjust to new pathogens. When B cells become activated by foreign antigens, they differentiate into antibody-producing plasma cells and memory cells, which can prevent disease upon subsequent contact with the same antigen.