Neurotransmitter targeted by Prozac (9)

I believe the answer is:

serotonin

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

I've seen this clue in The New York Times.

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