complexity of great white shark's behaviour may surprise you

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Natural-born painkiller found in human saliva

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Sea Urchin genome helps unravel secrets of human genome

WASHINGTON (Reuters) - Sea urchins may be blind, but they have the same genes that help people see, as well as genes for a sense of smell and one of the most complicated immune systems in the animal world, researchers reported on Thursday.

They also have genes associated with diseases such as Huntington's and muscular dystrophy, offering new routes to understanding illnesses, the researchers write in Friday's issue of the journal Science.

The sea urchin -- a pincushion-shaped animal found at the bottom of the sea and perhaps best known for its long, sharp spines -- shares more than 7,000 genes with humans, the international team of researchers found.

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