To define the epithelial/tumor cellular landscape of human BCC and PTS samples, we subclustered 30,058 KRT14+ epithelial-derived cells (kPTS = 5146 versus kBCC = 24,872) and identified 15 coarse-grained epithelial cell clusters, all defined by expression of unique gene biomarkers (Fig. 2, A to C). The gene discussed is KRT14; the disease is skin basal cell carcinoma.