The content, distribution and mode of occurrence of chromium in coals are influenced by many factors, such as coal-forming environment, coal-forming plants, and the epigenesis.

煤中铬的含量和赋存状态受成煤环境、成煤植物和后生地质作用等因素的影响。

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The most advanced among them, however, are now beginning to find another factor, which they have called epigenesis, the creative impulse.

然而，在他们中最高级的现在正在寻找另外的因素，他们称这种因素为渐成说，是创造的推动力。

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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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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.

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Epigenesis is yet another way of regulating transcription (the methylation stops this happening).

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