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Science  07 Mar 2014:
Vol. 343, Issue 6175, pp. 1062-1064
DOI: 10.1126/science.343.6175.1062-c

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Summary

Researchers interested in studying and preventing strokes have their eye on the capybara. The world's largest rodent shuts off a main blood supply to its brain, then manages to compensate by expanding another artery.