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Reconstructed of images of the mouse pulmonary vasculature at (A) 2 weeks of age, (B) 4 weeks of age, and (C) 3 months of age. The generation of a vessel is represented by a color gradient from blue (low) to red (high). Qualitatively, there is increased density and complexity in the pulmonary vasculature as age increases. (Color version of figure is available online.)
