The function of the immune system is to recognize
and to eliminate invading foreign organisms.
The immune response must be fast,
specific, and aimed exclusively against foreign
molecules or cells harboring an infective agent,
but never against its own normal cells. The effector
molecules must be prepared for contact
with a variety of organisms and molecular
structures. With these requirements, an extremely
efficient, genetically complex immune
system has evolved. Its development and function
are regulated by genes of extraordinary diversity.
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