Growth Inhibition and G1 Cell Cycle Arrest Mediated by 25-Methoxyhispidol A, a Novel Triterpenoid, Isolated from the Fruit of Poncirus trifoliata in Human Hepatocellular Carcinoma Cells - Hong, Ji- Young; Min, Hye-Young; Xu, Guang Hua; Lee, Jong-Gu; Lee, Seung-Ho; Kim, Young Shik; Kang, Sam Sik; Lee, Sang Kook (Planta Medica, 2008)