TNFRSF19 and hydrops fetalis: In conclusion, our study identifies epidermal basal cells in the IFE and INF with stem cell capacity marked by Troy. In contrast to other IFE-associated stem cell markers, such as Axin2 and Lgr6 (Füllgrabe et al., 2015; Lim et al., 2013), Troy is confined to the basal layer of the cornifying compartment and not robustly expressed in the SG or lower HF in telogen skin.