human_reference_atlas part of has part type I pneumocyte type II pneumocyte lung pericyte Homo sapiens organ part alveolus of lung pulmonary alveolar parenchyma EMAPA:37942 uberon AS pulmonary alveolar parenchyma The distinguishing cell types of the lung alveolar tissue, including pulmonary epithelial cells (pneumocytes), alveolar capillary endothelial cells, interstitial cells (fibroblasts) and alveolar macrophages. pulmonary alveolar parenchyma UBERON:0008870