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c-FOS and P-ERK responses to light exposure at night in the suprachiasmatic nuclei of mice fed a low- or high-fat diet. Mice were exposed (‘Light’; n = 4) or not exposed (‘Dark’; n = 4) to a light pulse at CT13 or CT22. *P < 0.05 between feeding conditions, #P < 0.05 between dark and light conditions. Scale bar = 500 μm. ROD: relative optical density.
