enzymology metabolism article 166 animal 99 nonhuman 70 genetics 66 Animals 60 chemistry 54 growth, development and aging 51 priority journal 51 controlled study 47 kinetics 47 Kinetics 46 enzyme activity 45 Article 44 physiology 41 Animal 40 Support, Non-U.S. Gov't 40 drug effect 39 biosynthesis 38 Rats 33 rat 33 unclassified drug 31 gene expression regulation 30 isolation and purification 29 Liver 25 human 25 liver 25 male 25 Male 24