Hepatocyte Nuclear Factor 1 Alpha and 4 Alpha are Factors Involved in Interindividual Variability in the Expression of UGT1A6 and UGT1A9 but not UGT1A1, UGT1A3 and UGT1A4 mRNA in Human Livers††This work was supported by grants-in-aid from the Ministry of Health, Labor and Welfare of Japan (Health and Labor Sciences Research Grants, Research on Human genome, Tissue Engineering; Health and Labor Sciences Research Grants, Risk Analysis Research on Food and Pharmaceuticals), and was partially supported by grants (18890044 and 17790112) from the Ministry of Education, Sciences, Sports and Culture of Japan.