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The distribution of S100β, MT1 and MT2 proteins in the cerebellar cortex in the primate Sapajus apella. Photomicrographs of frontal brain sections show MT1 protein (A,B) (red) or MT2 protein (C,D) (red) and S100β (green) at two time points, one during the day (ZT 10) and another at night (ZT 19). The arrows indicate the co-localization (merge) of S100β and melatonin receptors. Bar = 100 μm.
