PDGFRB and Alzheimer disease: Our analysis indicated that the temporal hemiretina (ST and TI) had early substantial decreases in vertical vascular PDGFRβ in MCI (Fig. 2i, j), whereas the percentage of PDGFRβ area loss was only significant at later disease stages in the nasal hemiretinal quadrants (NS and IN), as seen in AD (Fig. 2g, h).