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Do not have eyes, this bracelet worm can distinguish colors

Color perception is an important aspect for organisms to navigate their activities. So far, the ability to see color has depended on the presence of the eye or the gene coding for opsin – a protein that is sensitive to light. However, some organisms, such as roundworms Caenorhabditis elegans, don’t have that visual system. Then, how can these worms find food and distinguish between safe and dangerous foods?

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