human_reference_atlas part of has characterizing marker set has marker component SCEL SEMA3B EPCAM CLIC5 CDH1 SFTA2 RTKN2 SLC39A8 HOPX GRAMD2A AGER ELF3 FXYD3 AQP4 KRT1 cell cell type (from CL) pneumocyte type I pneumocyte pulmonary alveolar type I cell type 1 pneumocyte AT1 type I alveolar epithelial cells membranous pneumocytes type I alveolar cells CL:0002062 alveolar type i cell type 1 alveolar epithelial cells CT BTO:0000780 FMA:62500 ATI A type I pneumocyte is a flattened, branched pneumocyte that covers more than 98% of the alveolar surface. This large cell has thin (50-100 nm) cytoplasmic extensions to form the air-blood barrier essential for normal gas exchange. squamous alveolar lining cell lung type 1 cells alveolar type I cell small alveolar cells 2010-06-23T04:37:54Z squamous alveolar cell Homo sapiens sequence collection respiratory tract respiratory system lower respiratory tract lung pulmonary alveolar duct terminal bronchiole respiratory bronchiole alveolus of lung pulmonary alveolar parenchyma pulmonary acinus secondary pulmonary lobule