Lungs were gravity inflation–fixed with 2% paraformaldehyde, 2% glutaraldehyde, and 0.1% calcium chloride in 0.1 M sodium cacodylate buffer, pH 7.2, followed by immersion fixation with fresh fixative at 4°C overnight. Lung lobes were cut into 1–2 mm blocks and processed for transmission electron microscopy as previously described (66 (link)). Images were digitally acquired by an H-7650 transmission electron microscope (Hitachi High Technologies) equipped with a CCD camera (Advanced Microscopy Techniques) at 80 kV.
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