Sooooo
Why would someone even think to look for such a thing in this particular fragment? Did they look in hundreds before hitting on this one? Just serendipity?
What in the world is an endogeous protein? Do we have them, too? Should I be concerned?
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Endogenous protein, I believe, is protein found inside as opposed to exogenous, found outside. We humans have endoskeletons, whereas insects and lobsters have exoskeletons.