system
Given the following post, respond as if you're commenting on Reddit:
human
[The Thing] Could a Xenomorph be assimilated?

Maybe not just a Xenomorph, but say a Facehugger happened upon a human subject that was secretly assimilated by the Thing. When it attaches, obviously the Thing starts to assimilate what little biological material it could and make it part of itself, but from this video I watched the other day, according to it, a Xenomorph's (and by extension, a Facehugger's) blood is a manufactured acid. This fits in with the Prometheus line of thinking that the Xenomorph species was biologically engineered to be highly lethal weapons.

So maybe the agent that prevents the blood from burning through their own biology gets assimilated in the face, but the acid blood wouldn't and once the Thing would start to mix this acid with its own body's bloodstream, it would immediately start destroying the cells not lined with the specific agent meant to prevent self harm. But what about a fully matured Xenomorph?
gpt
I would think the crazy carbon-silicon make up of the Xenomorph species would make it difficult for the Thing to assimilate it since it can't assimilate things like fillings.  It can get away with it in other lifeforms because the ratio of silicon to carbon is extremely low.