FGF23 and myocardial infarction: Here, we showed a clear expression of Fgf23 in cardiac fibroblasts of healthy mice, whereas Schumacher et al. found Fgf23 to be expressed by cardiac fibroblasts only immediately after myocardial infarction (MI) during the inflammatory phase, but neither in later phases nor in health (Schumacher et al., 2019).