In vitro TGF-β1 Antagonistic Activity of Ursolic and Oleanolic Acids Isolated from Clerodendranthus spicatus - Yoshimura, Hiromitsu; Sugawara, Koko; Saito, Masako; Saito, Shiuji; Murakami, Shigeru; Miyata, Noriyuki; Kawashima, Akira; Morimoto, Shigeo; Gao, Nannan; Zhang, Xingguo; Yang, Junshan (Planta Medica, 2003)