Although the lower expression level, hepatocyte expressing miRNA-223 was previously reported to play important roles in hepatic biological synthesis, cholesterol uptake, and efflux by targeting a complex gene set including Hmgcs1, Sc4mcl, Acat2, Scarb1and Abca1 etc., and miRNA-223 KO contributes to hypercholesterolemia and augments cholesterol accumulation in the liver 13. This evidence concerns the gene ACAT2 and familial hypercholesterolemia.