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. 2019 Aug 21;9:299. doi: 10.3389/fcimb.2019.00299

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Copyright © 2019 Ryndak and Laal.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Color overlay of trans-electron micrograph of the alveolar barrier. Adapted from Burns et al. (2003) with author's permission (Dr. Alan R. Burns) and the permission of Physiological Reviews (American Physiological Society). AL, alveolar lumen; CL, capillary lumen; ECM, extracellular matrix; BM, basement membrane. Blue = Type 2 AEC; Green = Type 1 AEC; Yellow = EC; Red = fibroblast; Orange = pericyte.