Hepatocytes were isolated from the murine liver using the collagenase perfusion method8 (link) and subjected to primary culture on a bovine type I collagen-coated dish (AGC TECHNO GLASS, Shizuoka, Japan). In some experiments, primary hepatocytes were cultured in dishes precoated with recombinant human Jagged-1 Fc-chimera protein (R&D Systems, Minneapolis, MN). Gamma secretase inhibitor IX (DAPT; Merck, Darmstadt, Germany) was diluted in dimethyl sulfoxide (Sigma-Aldrich) before use.
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