Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Reconstructed alveolus-like structures in vitro were observed under phase contrast microscope. The structures were observed after 7 (A), 14 (B) and 21 (C) days. Reproduced from reference (19) with permission from Wiley & Sons Ltd. Cells gathered to grow (white arrow) could be observed in some parts of the alveolus-like structures (B). Scale bar: 200 µm.
