TP53 and fetal growth restriction: Having also found that SASP components and their regulatory pathways NF‐κB and JAK‐STAT were upregulated in human syncytiotrophoblast cultures (Fig 4D, G and H) and downregulated in murine placentas lacking p53 and Cdkn2a (Fig 5A), we compared the activation levels of these pathways in human normal and IUGR placentas.