One of the more elegant non-specific immune defense mechanisms is the COMPLEMENT CASCADE. Others include the skin, granulocytes, inflammation, macrophages...a whole host of protein-based (and therefore GENETIC) processes.
Evolution has resulted in our ability to rapidly respond to any and all "invaders", and through sexual reproduction to "keep up with the parasites" (the theory of the Red Queen) .
Fearfully and wonderfully made!
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