In contrast, PBX1 overexpression in H2O2-treated and -untreated HF-MSCs significantly decreased the percentage of apoptotic positive cells (P < 0.05; Figures S2c, d), and that of SA-β-gal-positive cells (P < 0.05; Figures S2a, Sb). This evidence concerns the gene PBX1 and hydrops fetalis.