A small beanshaped organ of the immune system, distributed widely throughout the body and linked by lymphatic vessels. Lymph nodes are garrisons of B and T cells, dendritic cells, macrophages, and other kinds of immune cells.
A transparent, slightly yellow fluid that carries lymphocytes, bathes the body tissues, and drains into the lymphatic vessels.
A major group of lymphokines and monokines.
A protein produced by cells that stimulates antivirus immune responses or alters the physical properties of immune cells.
An immune system function that is inborn and provides an all-purpose defense against invasion by microbes.
Redness, warmth, and swelling produced in response to infection; the result of increased blood flow and an influx of immune cells and their secretions.
An immune system reaction to “foreign” invaders such as microbes or allergens. Signs include redness, swelling, pain, or heat.
Capable of reducing immune responses.
One of a family of large protein molecules, also known as antibodies, produced by mature B cells (plasma cells).
Reaction of the immune system to foreign substances. Although normal immune responses are designed to protect the body from pathogens, immune dysregulation can damage normal cells and tissues, as in the case of autoimmune diseases.