Acyltransferases, Amino Acid Sequence, Animals, Bile Acids and Salts, Chemistry Techniques, Analytical, Cloning, Molecular, Coenzyme A Ligases, DNA, Complementary, Gas Chromatography-Mass Spectrometry, Glycine, Humans, Mice, Microsomes, Liver, Molecular Sequence Data, Molecular Structure, Phylogeny, Rats, Recombinant Proteins, Spectrometry, Mass, Electrospray Ionization, Substrate Specificity