The regions of interests (ROIs) (rectangular markers) from (1) splenium, (2) thalamus, (3) CSEM, (4) caudate, (5) putamen, (6) FWM, (7) genu, and (8) FGM are illustrated in the coronal T2 weighted images (top), EPI images (middle), and magnetization transfer ratio maps (bottom) of an adult macaque brain. CSEM, centrum semiovale; FWM, frontal white matter; FGM, frontal gray matter; EPI, echoplanar imaging.