Previous studies utilizing IHC and western blot analyses on postmortem retinas from AD donors have identified retinal total tau (HT7 clone) and p-tau forms at multiple phosphorylation sites, including S202, T205, T217, T212, S214, T181, T231, S396, and S404 [20, 21, 31, 34, 65, 70, 87]. Here, MAPT is linked to Alzheimer disease.