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| Densities on the inner alveolar membrane (iam) at its corners with septa. These densities may be involved in calcareous platelet formation within the alveoli or in stabilizing the surface shape. Filamentous material fills the cytosolic space between two densities. Rough endoplasmic reticulum (rer) bears prominent ribosomes. EM taken on 3/4/69 by R. Allen with Philips 300 TEM. Neg. 39,900X. Bar = 0.25µm. |
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