RGS5 and skin basal cell carcinoma: To discern whether cellular and spatial FIB or FIB-like heterogeneity exists in human BCC and PTS regions, we subclustered FIB and FIB-like cells based on expression of PDGFRA and RGS5, yielding a total of 7080 cells (kPTS = 1305 versus kBCC = 5775) (Fig. 3, A and B).