A more intriguing possibility, though, is that the relevant genes are affected by epigenesis, a process in which chemicals attached to the DNA control its activity.

然而，一个更有意思的可能性是后生作用影响了这些基因。后生作用是指与DNA相接的化学物质来控制其活动。

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A more intriguing possibility is that our genetic makeup includes a signal encoded by aliens in our DNA that might have been left hundreds of millions of years ago.

VOA: standard.2010.04.16