p.F295L/F297V/Y337A Phe295Leu/Phe297Val/Tyr337Ala (p.F326L/F328V/Y368A Phe326Leu/Phe328Val/Tyr368Ala in primary sequence with 31 amino-acids signal peptide) Acyl specificity;replacement of aromatic active center residues in human-ACHE by the corresponding residues in human-BCHE