we found that clinically effective concentrations , 0.03-0.3 microm , readily inhibit acetylcholinesterase and butyrylcholinesterase from rabbit hippocampal tissue in artificial cerebrospinal fluid ( csf ) at 37 degrees c with physiological levels of substrate above 1 microm , tha was found to act at primary and allosteric sites on m1 and m2 muscarine receptors as an antagonist .
C0001044
acetylcholinesterase
C0008429
butyrylcholinesterase