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In the third place: Inspired by the tetrahydroisoquinoline (THIQ) alkaloid noscapine, inhibitors of tubulin polymerization that bind to a site different from the colchicine and the vinca alkaloid binding sites have been synthesized. One compound is more potent than noscapine in HeLa cells and can overcome resistance to chemotherapeutics.
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Zimmermann et al. (2013) studied this question.
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