But living healthy doesn’t guarantee longevity either,
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, a new study of sea urchins suggests. Red sea urchins (Mesocentrotus franciscanus) live well past 100 years old in the wild,
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, while purple sea urchins (Strongylocentrotus purpuratus) make it to 50,
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. But variegated (also called “green”) sea urchins (Lytechinus variegatus) normally die after four years,
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.
The difference in the species’ life spans might be due to different rates of aging,
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, thought aging researcher Andrea Bodnar at the Bermuda Institute of Ocean Sciences in St. George’s and developmental biologist James Coffman of the MDI Biological Laboratory in Salisbury Cove, Maine. Instead,
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, they found,
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, none of the species seem to age at all. Young and old members of each species are similar in their abilities to reproduce and to regenerate spines and tube feet, the researchers reported online April 20 in Aging Cell. Even though the short-lived variegated urchins have no signs of slowing down,
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, they still die. Why is a mystery, Coffman says.

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