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From three to four chambers

Scientists identify gene that may shape the heart

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4:19pm, September 2, 2009

Lizards and turtles are not warm and cuddly, but they do have hearts — and interesting ones, at that. One molecular difference in reptile hearts may have divided single ventricles into two, creating four-chambered hearts from three-chambered ones as species evolved, a study published in the Sept. 3 Nature finds.

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