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| Thickened alveolar densities (arrows) partially coat the alveolar membrane within the alveoli, particularly along its inner membrane at its corners with the septa. Fibrous systems lie within the cytoplasm next to these densities. pm, plasma membrane; ps, parasomal sac; c, cilium. EM taken on 5/28/69 by R. Allen with Philips 300 TEM. Neg. 14,800X. Bar = 0.5µm. |
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