RET and non-small cell lung carcinoma: Enrichment based on this atlas reveals that RET-dependent repressed signature in NSCLC may affect several normal lung cell subpopulations such as type I alveolar epithelial cells (AT1s), airway smooth muscle cells, alveolar fibroblasts, pericytes, IGSF21 positive dendritic cells, and vascular smooth muscle cells (green bars, Figure 2F).