title: Preliminary considerations on the identity of first and second-type alveolar cells in the human lung.
mesh_terms: D004721:Endoplasmic Reticulum / Q000502:physiology; D004847:Epithelial Cells; D004848:Epithelium / Q000502:physiology; D006801:Humans; D008854:Microscopy, Electron; D008928:Mitochondria / Q000502:physiology; D011650:Pulmonary Alveoli / Q000648:ultrastructure*