Recent work has demonstrated that tau fibrils isolated from different human tauopathies exhibit unique structural properties, showing that tau aggregates are disease‐specific entities (Falcon, Zhang, Murzin, et al., 2018; Falcon, Zhang, Schweighauser, et al., 2018; Falcon et al., 2019; Fitzpatrick et al., 2017; Sanders et al., 2014; Zhang et al., 2019). Here, MAPT is linked to tauopathy.