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Structures of pesticides and the adducts formed by covalent binding to Serine 198 of human BChE. Isomerization of diazinon via a thiono-thiolo rearrangement occurred in solution. The unlabeled active site peptide of BChE (accession number gi:116353) produced by digestion with trypsin has a monoisotopic mass of 2928.5 amu.
