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Background Dysregulation of circadian rhythms can contribute to diseases of lipid metabolism. NAD-dependent deacetylase sirtuin-1(SIRT1) is an important hub which links lipid metabolism with circadian clock by its deacetylation activity depends on intracellular NAD+/NADH content ratio. Hydrogen sulfide (H2S) is an endogenous reductant which can affect the intracellular redox state. Therefore, we hypothesized...