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Science 18 March 2005:
Vol. 307. no. 5716, p. 1705
DOI: 10.1126/science.307.5716.1705a
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News of the Week

EVOLUTION:
Special Hemoglobin Helped Swim Bladders Give Fish Diversity a Lift

Elizabeth Pennisi

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)