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.
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,
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, Maine. Instead, 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,
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, the researchers reported online April 20 in Aging Cell. Even though the short-lived variegated urchins have no signs of slowing down, they still die. Why is a mystery,
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, Coffman says.

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