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Nature Medicine 13, 406–408 (1 April 2007) | doi:10.1038/nm0407-406

Lung turns to AA (adenosine analogues) to dry out

James L Kreindler & Steven D Shapiro

Like the earth, we are composed primarily of water and are surrounded by air. To compartmentalize water in our bodies, we have systems for the active and passive movement of salt and water across cell membranes.