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 .

然而更加神奇的可能性是相关的基因受到后生作用的影响，这种影响是一个过程：化学物质依附在dna并控制dna的活动。

Statistically , that would not matter too much if the amount of epigenesis were the same in identical and fraternal twins , but research published last year by art petronis of the centre for addiction and mental health in toronto and his colleagues , suggests it is not .

从统计学上来说，如果同卵及异卵双胞胎发生后生现象的数量是相同的话，这并不会存在太多影响。然而在去年，多伦多毒瘾与心理健康中心的阿特?