A, the 12-μm-thick rat brain coronal section used in the study. Three distinct regions including cerebral cortex (CTX), corpus callosum (CC), and caudoputamen (CP) were dissected with a spatial resolution of 100 μm in diameter. B, The corresponding microscopic images of the tissue regions after dissection. C, Pairwise correlation plots with log2-transformed LFQ intensities between 12 tissue samples from the three regions. The color codes indicate the relatively high correlations between the same tissue regions and relatively low correlations between different regions.