Fig. 3From: The nicotine-degrading enzyme NicA2 reduces nicotine levels in blood, nicotine distribution to brain, and nicotine discrimination and reinforcement in ratsQuenching of NicA2 activity in brain in vitro by MeOH. Addition of MeOH to brain homogenate containing NicA2 prevented the degradation of subsequently added nicotine. However, a 10 s delay in adding MeOH to brain containing nicotine and NicA2 was sufficient to allow substantial degradation of nicotine. *** p < 0.001 using two-tailed unpaired t tests with Welch’s correction. Mean ± SD, n = 6/groupBack to article page