Lymphocytosis occurs when a person has too many lymphocytes, a type of white blood cell. Symptoms include swollen lymph nodes. It can indicate an underlying health problem, such as an infection ...

Lymphocytes are white blood cells that have important immune functions. The main populations of lymphocytes are B cells, T cells and natural killer (NK) cells. They are typically (although not ...

Save guides, add subjects and pick up where you left off with your BBC account. Each lymphocyte produces its own specific receptor that corresponds to a specific antigen. When a lymphocyte ...