MAPT and tauopathy: Moreover, the number of ChAT‐positive neurons is also decreased in the medial septum of old Tg601 mice, a model of tauopathy (Hara et al., 2017), whereas the unchanged levels of ChAT in transgenic models of mutated tau have been reported in other studies (García‐Gómez et al., 2016; Silveyra, et al., 2012).