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The gastrointestinal tract's immune system is often referred to as gut-associated lymphoid tissue (or GALT)  and works to protect the body from invasion.
Open Badges Research Ageing combines CD4 T cell lymphopenia in secondary lymphoid organs and T cell accumulation in gut associated lymphoid tissue
Figure 1: The gut-associated lymphoid tissue establishes perinatal host-microbiota mutualism in the intestine. From Reciprocal interactions of the intestinal...
The intestine and the gut-associated lymphoid tissue (GALT) are essential components of whole body immune defense, protecting the body from foreign antigens and...