MAPT and Machado-Joseph disease: Importantly, in exploratory MRS acquisitions performed in MJD patients, the profiles of the key neurometabolites NAA, NAA + NAAG, Glu and Tau (Fig. 3B to H) were like those observed for the Tg-ATXN-3-69Q model (Fig. 3A) (Additional file 11: Supp.