EGLN3 and anemia (phenotype): In this context, we could also not detect compensatory upregulation of PHD2 or PHD3 after HIF‐2 stabilization under anaemia or PHD inhibition, neither in medullary fibroblasts as a possible counterregulation to prevent EPO induction, nor in EPO+ and EPO− fibroblasts in the cortex (Fig. 9).