FGF23 and persistent truncus arteriosus: Additionally, Smith et al. pointed out that Fgf23 was induced in kidney fibroblasts after injury, which appears to be in line with the findings of Schumacher et al. regarding the induction of Fgf23 in cardiac fibroblasts after MI (Schumacher et al., 2019) and our finding of increased Fgf23 expression in cardiac fibroblasts after TAC.