Training mash of Utah biologists found new statement why mice, people and other vertebrate animals carry thousands of varieties of genes to make immune-system proteins named MHCs - even though some of those genes make us susceptible to infections and to autoimmune diseases. "Major histocompatibility complex" (MHC) proteins are found on the surface of most cells in vertebrate animals. They conspicuous self from foreign, and trigger an immune backlash against foreign invaders. MHCs recognize invading germs, reject or accept outland organs and play a role in helping us smell congenial mates...

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