> "Lyse the cell membrane"  ???

What cells?  

The exoskeleton of the mite must be chitin of some type or another. 

Chitin is like cellulose - it is essentially a long-chain polymer.  A "polysaccharide".

There's also a waxy coating on the mite's exoskeleton in the way of that amino acid.

I'll admit it - I daydreamed my way through biology, but even I know some basic mechanics here, and these folks have some 'splainin to do... there's some pretty tough "armor" to get through before you hit anything in the way of a "cell" that would interact with any amino acids.

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