还不知道7r是如何引起这种结果，可能是源于行为差异，或可能是不同的DRD4的变异体对消化和吸收食物的途径的影响不同。

How 7r causes this is not yet known. It may stem from behavioural differences or it may be that different versions of DRD4 have different effects on the way the body processes food.

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关键是，在已知变异基因方面，长寿与控制变量组之间并无差异。

Importantly, there was no difference in the presence of known disease-associated gene variants between the longevity and control groups.

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导致乳腺癌与直肠癌的变异基因截然不同也就说明这两种癌症的发病机制有着很大的差异。

The mutated genes in breast cancers and colorectal cancers were almost completely distinct, suggesting the two cancers develop along different pathways.

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