In this study, we used K15 (Figure 4A) as the HFSC marker in the bulge of HF, Ki67 (Figure 4B) as the cell proliferation marker in the hair bulb, and K14 (Figure 4C) as the cell marker in the ORS (Coulombe et al., 1989; Inoue et al., 2009). The gene discussed is KRT15; the disease is hydrops fetalis.