It had been thought that when a cancer cell split to create two new cells, the chromosomes were not split evenly between the two.

BBC: Thriving cancer's 'chaos' explained

The drugs bind to rod-like structures inside the cell called microtubules that, like moving train tracks, help chromosomes arrange and split in two during cell division.

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Polls show Americans who consider themselves conservatives are split right down the middle on whether they support stem cell research, and some pro-choice Americans actually oppose embryonic stem cell research.

CNN: Politics, science, morality of stem cell issue

Matt Herper: But there was a real split between the opinons of the oncologists, who had doubts, and the cell therapy folks, who were enthusiastic.

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