Other tau phosphorylation sites have been investigated in the CSF of AD patients including mid‐region residues p199, p212/p214, p217, p231, p231/p235 and the C‐terminal residues p396/p404 (Ishiguro et al, 1999; Kohnken et al, 2000; Hu et al, 2002; Buerger et al, 2002b; Hampel et al, 2004; Singer et al, 2009; Meredith et al, 2013; Russell et al, 2016; Janelidze et al, 2020b). This evidence concerns the gene MAPT and Alzheimer disease.