studies have been made on substrate specificity of acetylcholinesterase ( ache ; ec 3-1-1-7 ) from the electric organ of the ray t. marmorata with respect of choline and thiocholine esters , as well as on the effect of ph , salts and organophosphorus inhibitors ( opi ) on the activity of the enzyme .
C0008405
choline
C0039883
thiocholine