Disposition and Metabolic Fate of Cycloastragenol, a Potent Telomerase Activator:Pharmacokinetics and Metabolism in ratWEI Bao-hong LI Zhi-hui ZHANG Yu-jie YE Jing SUN Gui-xia YANG Xiao-yan XUE Bao-juan SU Jin CAO Yan-ling Zhang Jian-bao LIU Xiao-ya