Crossword Genius

Bodily chemical involved in mood regulation (9)

Ross

I believe the answer is:

serotonin

(Other definitions for serotonin that I've seen before include "Chemical compound in body" , "Compound acting as a neurotransmitter" , "Neurotransmitter compound; soon inert (anag.)" , "Compound present in serum - ironstone (anag)" , "Neurotransmitter hormone, involved in depression say" .)

I've seen this clue in The Times.
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