Write short notes on B-cells..

Explanation

B-cells (B - Lymphocytes) : The lymphocytes capable of producing antibodies and can capture circulating antigens are called B-cells. They are produced from the .stem cells. in the bone marrow of adult mammals, liver of foetus.and bursa of Fabricius in birds. Mature B-cells synthesize various types of antibodies which are displayed on their membrane surfaces. As these antibodies can take antigens, the mature B-cells are also called immuno - competent B - cells. These mature immuno - competent B - cells reach the secondary lymphoid organs and develop into functional immune cells which later differentiate into .long lived. memory cells and .effector. plasma cells. The plasma cells produce antibodies specific to the antigen to which they are exposed. Memory cells store information about the specific antigens and show quick response, when the same type of antigen invades the body later.