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Epithelial bridges that provide mechanical support for the avian pulmonary capillary. A: high-power electron microscope section. Note the 2 epithelial cells making up the bridge and its extreme thinness. B: screen shot from an electron tomography study. This image shows an epithelial bridge connecting 2 capillaries. This screen shot is from a short Supplemental Video available online. The video shows the arrangement more clearly.
