Xenograft tumor models were as poorly predictive then as they are now, and they believed inducible cancer models would better reflect the disease.

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And it may be possible to engineer a genetic switch, known as an inducible promoter, into the crop, along with the anti-meiosis genes.

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Of great interest is the physiological pathway called the hypoxia-inducible factor, or HIF, which seems to trigger the body's response to low-oxygen levels in tissue.

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