Fig. 2

Transmission electron photography, uranyl acetate and lead citrate contrast technique. Close-up of an alveolar capillary in the Steen® solution group. (A) shows an erythrocyte (Ery) in the lumen. The endothelial cell surface displays short, discreet electrodense projections (arrows) suggestive of EG. (B) shows the lumen (L) occupied by slightly electrodense proteinaceous material. The box contains an image of pinocytic vacuoles in the cytoplasm (arrows)

C) shows a bridge between an (Ery) and the completely smooth surface of an endothelial cell. (D) shows a close-up of an endothelial cell. The (L) is clearly occupied by slightly electrodense proteinaceous material. The endothelial cell surface displays short, discreet electrodense projections (arrows) suggestive of EG. The box contains an image of an endothelial cell cytoplasm with numerous pinocytic vacuoles. (Nu) endothelial cell nucleus