It's complicated: When immune cells come into contact with a foreign substance (called an antigen), they engulf that substance and either start making antibodies to it or activate other immune cells to come into the area to fight off the foreign invader. Antigens are fairly specific so antibodies that form are also fairly specific. Sometimes mistakes occur however. Here's a link to more: http://bit.ly/1uy9lyG
Answered 11/30/2014
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