鼠类研究的主要作者Jeremy Nathans说，可能在亿万年前一种特别的突变造成感光素基因中两种不同的感光色素基因编码定位于同一个X染色体上。

It's plausible that millions of years ago a single mutation resulted in two different versions of the photopigment gene becoming located on the same X chromosome.

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不同荧光色的绢丝蛋白的电泳谱，仅与其在蚕体中的部位有关，而与品种无关；

It is found that the electrophoretogram of the different fluorescent silk proteins is independent of the silkworm variety, but has relation to the location of the protein in the silkworm body;

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