KRT19 and neoplasm: Clustered stromal cells corresponded to endothelial cells (positive for PECAM1/CD31, VWF), normal fibroblasts (FN1, EGFL6), tumor-associated fibroblasts (TAFs; PDGFRA, ADH1B), and thymic epithelial cells (TECs; KRT19, S100A14) (Fig. 3a, Supplementary Fig. 9a).