abnormal type I pneumocyte morphology decreased type I pneumocyte number 2011-02-11T02:43:57Z CL:0002062 FMA:62500 MP:0010816 MPheno.ontology csmith decreased AT1 number decreased ATI number decreased Pulmonary alveolar type I cell number decreased Type 1 pneumocyte number decreased lung type 1 cell number decreased membranous pneumocyte number decreased small alveolar cell number decreased squamous alveolar cell number decreased squamous alveolar lining cell number decreased type 1 alveolar epithelial cell number decreased type I alveolar epithelial cell number decreased type I cell number decreased type I pneumonocyte number reduced AT1 number reduced ATI number reduced Pulmonary alveolar type I cell number reduced Type 1 pneumocyte number reduced lung type 1 cell number reduced membranous pneumocyte number reduced number of the flattened, branched squamous cells that covers more than 98 percent of the alveolar surface, and have thin (50-100 nm) cytoplasmic extensions to form the air-blood barrier essential for normal gas exchange reduced small alveolar cell number reduced squamous alveolar cell number reduced squamous alveolar lining cell number reduced type 1 alveolar epithelial cell number reduced type I alveolar epithelial cell number reduced type I cell number reduced type I pneumocyte number reduced type I pneumonocyte number