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- noun biochemistry A mercapto
quaternary ammonium compoundwith formula (CH3)3N+CH2CH2SH−; it is used as a reagentfor the determination of cholinesterases
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From thio- + choline
 owing to a reaction between the substrate, thiocholine, and the Cys-targeting sulfhydryl reagents under study.
PLoS ONE Alerts: New Articles Yuan-Ping Pang et al. 2009