a, Representative images of insulin-GFP expression and MitoTracker staining (red) in PBS- and WNT4-treated HILOs (scale bar, 100μm). b, Flow cytometry quantification of insulin expression (GFP) and mitochondrial content in HILOs treated with recombinant human WNT4 (rhWNT4), WNT5A (rhWNT5A), or conditioned media (CM) from control or WNT5A overexpressing fibroblasts (n=3) c, Venn diagram showing overlap between WNT4-induced increases in chromatin accessibility in GFP+ cells and increases in HILO gene expression (upper panel), and gene ontology pathways enriched in the intersection gene set. d, Motifs enriched in the intersection gene set from (c). e, Chromatin accessibility at ERRγ target genes determined by ATAC-Seq in insulin-expressing cells sorted from HILOs treated with PBS or WNT4 (wHILO) for 7 days (fold change>1.5). Error bars represent ± SEM. *p<0.05, one-tailed, student’s paired t test. Data representative of 3 (a, b) or 2 (c-e) independent experiments.