Immunofluorescence for β-catenin in hepatoblastomas showed three patterns: cells with low nuclear and primarily membranous staining (Low in Fig. 3a), those with intermediate nuclear staining (Med in Fig. 3a), and foci of cells with high nuclear staining (High in Fig. 3a) that co-localized with regions of FGF19 expression in serial sections (Fig. 3b). Here, FGF19 is linked to hepatoblastoma.