Not all foreign bacteria in the body are dangerous. Some of them, especially those present in the gut are vital for the process of digestion and absorption of food. A team of American researchers has found that an organ known as thymus teaches the immune system to ignore such vital bacteria. When immune cells recognize essential gut bacteria as foreign, inflammatory bowel disease such as ulcerative colitis and Crohn's disease can be the painful, debilitating result. ...
via Medindia Health News
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Lake forest health and fitness http://healthandfitness1blog.blogspot.com/2013/05/thymus-teaches-immune-cells-to-ignore.html
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