Human eyes have three cone cell types, with each type dedicated to receiving either blue, green or red light.

人类拥有三种视锥细胞，每种细胞都有各自的用途，可用于接收蓝色光、绿色光或红色光。

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But no cone cells were observed in 10 of the 17 species, while only one type of cone cell appeared to be present in the other 7.

但是17种鲨鱼中有10种都没有视锥细胞，其他7种鲨鱼也都只具有一种单一的视锥细胞。

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The scientists, who examined retinas of 17 different species of shark, discovered that the creatures had only one type of colour-sensitive cell, known as a cone cell, in their eyes.

科学家通过调查了17个不同种类的鲨鱼后发现这种生物眼睛内只具有一种感色细胞，称为“视锥细胞”。

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Some areas identified as particularly human are the regulation of the cone cells of the retina (which are involved in colour vision) and the regulation of nerve-cell growth.

ECONOMIST: Evolution