Lymph nodes are major sites of B lymphocytes that plays a central role in cell-mediated immunity.
A lymph node or lymph gland , is an ovoid or kidney-shaped organ of the lymphatic system , and of the adaptive immune system , that is widely present throughout the body .	ovoid	oval	organ	Organ (anatomy)	lymphatic system	lymphatic system	adaptive immune system	adaptive immune system	kidney	kidney
Like the innate system , the adaptive system includes both humoral immunity components and cell-mediated immunity components .	immunity	immunity (medical)	humoral immunity	humoral immunity	cell-mediated immunity	cell-mediated immunity
Lymph nodes are major sites of B and T lymphocytes , and other white blood cells .	B	B cell	T	T cell
