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Due to their common origin, they have many elements in common and should be analyzed together.
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Many researchers now believe most of these disorders share a common origin: clusters of deformed proteins that pile up in the brain over the years, slowly poisoning brain cells.
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That similarity, though, is almost certainly the result of convergent evolution rather than a common origin, since the last joint ancestor of Crassicorophium and spiders lived way longer ago than the ancestor of Crassicorophium and barnacles.
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