Flow cytometric estimation on cytotoxic activity of leaf extracts from seashore plants in subtropical Japan: isolation, quantification and cytotoxic action of (-)-deoxypodophyllotoxin - Masuda,T.; Oyama,Y.; Yonemori,S.; Takeda,Y.; Yamazaki,Y.; Mizuguchi,S.; Nakata,M.; Tanaka,T.; Chikahisa,L.; Inaba,Y.; Okada,Y. (Phytother Res, 2002)