Targeted deletion of the intronless sterol 12α hydroxylase (CYP8B1) gene in mice leads to loss of cholic acid production but upregulated bile acid synthesis: Mats Gafvels, Div of Clin Chem Huddinge Univ Hsp, Stockholm Sweden; Julia Li-Hawkins, Mol Genetics, UTSW Med Center, Dallas, TX; Maria Olin, Div of Clin Chem Huddinge Univ Hsp, Stockholm Sweden; Eirk Lund, Mol Genet UTSW Med Center, Dallas, TX; Ulla Andersson, Div of Clin Chem Huddinge Univ Hsp, Stockholm Sweden; Gertrud Schuster, Center for Biotechnol, Novum, KI, Stockholm Sweden; Ingemar Bjorkhem, Div of Clin Chem Huddinge Univ Hsp, Stockholm Sweden; David Russell, Mol Genet, UTSW Med Center, Dallas, TX; Gosta Eggertsen, Div of Clin Chem, Huddinge Univ Hsp, Stockholm Sweden