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| Septa of bordering alveoli when lying in the plane of section exhibit pores (sp) at their outer margins closest to the plasma membrane. This shows that there is physical continuity between the lumens of alveoli (al). Basal bodies (bb) and fibrous systems are found in the cellular cortex beneath the ridges. per, peroxisome; m, mitochondrion. Cacodylate buffered fixative. EM taken on 11/2/68 by R. Allen with Philips 300 TEM. Neg. 20,500X. Bar = 0.5µm. Published in J. Cell Biol. 49:1-20, 1971. |
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