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Alveolar Type II cells from seven mammalian species were examined for a protein in the rough endoplasmic reticulum (RER), which showed a multilayered, repeating motif. Each motif, 100 nm in width, comprised two parallel outer dense layers, a less dense central layer, and often 1–3 faint layers on either side of the latter. Outer layers showed periodicities at 3–4 densities/100 nm of width, while layers...
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