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| A cell with a flat alveolar sac system (al). It is not clear why some cells have expanded alveoli and others have flattened alveoli. per, peroxisome; m, mitochondrion; er, endoplasmic reticulum. Cacodylate buffered fixative. EM taken on 2/3/69 by R. Allen with Philips 300 TEM. Neg. 20,500X. Bar = 0.5µm. |
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