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ACh metabolizing enzyme activities of Hb9:CHT mice. (A) ChAT activity is not affected by the Hb9:CHT transgene (CHT+/+ n=3, Hb9:CHT n=4; two-tailed t-test, P>0.1). (B) AChE activity is also not affected (CHT+/+ n=3, Hb9:CHT n=5; two-tailed t-test, P>0.1).