Immunofluorescence staining also showed substantially increased cell division (Ki67+) in HF and IFE keratinocytes of irradiated WT mice and was strongly reduced by the sgp130‐mediated trans‐signaling blockade, thus confirming that the keratinocyte hyperplasia is in part IL‐6 dependent (Appendix Fig S9B). Here, MKI67 is linked to hydrops fetalis.