Solved cryptogram

Xenon is a noble gas that can put a patient to sleep, though nobody agrees on quite how.

Chemistry Facts, sourced to Royal Society of Chemistry.

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What it means

Noble gases are supposed to be chemically inert, so an anesthetic effect is a genuine puzzle. Xenon appears to work by physically blocking certain receptors in the nervous system rather than by reacting with anything. It is an excellent anesthetic on the merits, with rapid onset and few side effects, and it is barely used because extracting it from air is expensive.

The claim comes from Royal Society of Chemistry.

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