A variety of specialized lymph-reticular tissues that line the inside of an animal’s digestive system. GALT include Peyer’s Patches, the appendix, and small solitary lymphoid tissues in the gut. They constitute the intestinal immune system (response to antigens).
A term used for all lymphoid tissue associated with the gastrointestinal tract, including the tonsils, appendix, and Peyer’s patches. GALT contains lymphocytes, primarily B cells, and is responsible for controlling microorganisms entering the body via the digestive system.