NPC1L1 and metabolic syndrome: The expression levels of NPC1L1, MTP, and ApoB48 after GLXB herb pair intervention were detected by protein blotting to further determine whether the GLXB herb pair exerts a therapeutic role in treating dyslipidemia in ApoE-/- mice by inhibiting intestinal cholesterol absorption through increasing the levels of the intestinal microbial metabolite butyric acid.