3. Immune System

The immune system depends on protein to mount a defense against pathogens and maintain the barriers that keep pathogens and harmful substances out of the body. Specialized white blood cells called B lymphocytes circulate in the bloodstream and produce antibodies, proteins essential for fighting off viruses or bacteria. The complement system within the immune system uses proteins on cell membranes to guide various types of white blood cells wherever they are needed to fight infection.

immune system protein


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