The benzylisoquinoline alkaloids, berberine and coptisine, act against camptothecin-resistant topoisomerase I mutants by Naomi Inoue, Takeshi Terabayashi, Yuri Takiguchi-Kawashima, Daisuke Fujinami, Shigeru Matsuoka, Masanori Kawano, Kazuhiro Tanaka, Hiroshi Tsumura, Toshimasa Ishizaki, Hisashi Narahara, Daisuke Kohda, Yoshihiro Nishida, Katsuhiro Hanada

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