Fenestrae in the alveolar membrane of the human lung.
D000328:Adult; D000368:Aged; D000375:Aging; D002196:Capillaries / Q000166:cytology; D002675:Child, Preschool; D004547:Elastic Tissue / Q000166:cytology; D004847:Epithelial Cells; D005260:Female; D006801:Humans; D008168:Lung / Q000033:anatomy & histology / Q000254:growth & development; D008264:Macrophages; D008297:Male; D008566:Membranes / Q000166:cytology; D008854:Microscopy, Electron; D008875:Middle Aged; D011650:Pulmonary Alveoli / Q000166:cytology*; D011656:Pulmonary Emphysema / Q000209:etiology / Q000473:pathology; D013194:Staining and Labeling