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This picture shows a Zebrafish eye and neuromasts. This four-day-old zebrafish embryo has been modified so scientists can understand the genetics behind the development of the eye. The Zebrafish eye is particularly interesting because it responds to movement in the water and is essential for avoiding predators and help it keep up with its school. The blueish-green lines are its nervous system, which is also being studied by experts at University College London. (Photo by Ingrid Lekk/Steve Wilson/Wellcome Images/UCL)
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