MAPT and Alzheimer disease: We found increases in Tau phosphorylation in Ser202, Thr205 and in Thr231 by immunofluorescence staining (AT8 and T231, respectively), as well as deposition of Aβ in retinal tissues by immunofluorescence for 4G8 and staining for NIAD-4 in AD-ROs compared to CTR-ROs.