But there was, if anything, a worse story on that front page with only minor variations from our hypothetical scenario.

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The newspaper said the Supreme Court ruling had "clarified that it does not mean no minor variations are patentable - that assessment depends on the therapeutic efficacy".

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Such variability could be due to environmental factors, but Dr Gibson suspected it might actually be due to minor variations in the healthy copy of the Egfr gene.

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They said there were also a large number of other, more minor, variations.

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