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Special Hemoglobin Helped Swim Bladders Give Fish Diversity a Lift

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Science  18 Mar 2005:
Vol. 307, Issue 5716, pp. 1705
DOI: 10.1126/science.307.5716.1705a

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On page 1752, researchers use the fish family tree to piece together how an internal air sac called a swim bladder evolved a complex capillary network and special hemoglobin molecule to inflate it with oxygen, innovations that they claim helped fish expand their species diversity.