PLAUR and hydrops fetalis: Expression of Plaur mRNA, which encodes the urokinase‐type plasminogen activator receptor (uPAR), a protein that is broadly induced on the surface of senescent cells (Amor et al, 2020), mirrored the increased senescence score, particularly within irradiated HF and basal keratinocytes (uHF/INFU‐B, IFE‐B) and SG‐derived cells (Fig EV1C).