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Mouse lung. Glycocalyx staining on intraalveolar surfactant. Intraalveolar surfactant material is visible on top of the alveolar epithelium as secreted lamellar body content (a) and as tubular myelin (b) with lattice-like structure. Both are stained, particularly at the outside, with thorium dioxide, like the surface of the alveolar epithelium (arrowheads).
