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Cat serum contains 0.5 mg/L of butyrylcholinesterase (BChE, EC 3.1.1.8) and 0.3 mg/L of acetylcholinesterase (AChE, EC 3.1.1.7); this can be compared with 5 mg/mL and < 0.01 mg/L, respectively, in human serum. Cat BChE differed from human BChE in the steady-state turnover of butyrylthiocholine, having a 3-fold higher k cat and 2-fold higher K m and K ss values...