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Third eye

Third eye

作者:越统秀  时间:2019-03-07 04:09:00  人气:

FROGS with an eye in the back of their heads have taught biologists a valuable lesson about evolution. In fruit flies, a protein called Pax6 can trigger the formation of extra eyes, suggesting that it plays a key role in normal eye development. But it was not clear if Pax6’s role as eye architect was the same in higher animals. Now Richard Lang of New York University Medical Center and his colleagues have shown that giving frog embryos an extra dose of Pax6 can cause a third eye to grow in the back of their heads by the time they are tadpoles. But Lang’s team believes Pax6 cannot pull off this trick by itself. They write in Development (vol 126, p 4213), that because the eyes develop only in the head region,