New discussion regarding the need for PGRMC1 knockout studies to clarify the role of PGRMC1 in decidualization has been inserted in page 9,
The discussion must qualify the results of Salsano et al. who used AG-205 to inhibit PGRMC1. There was no control in PGRMC1 genomic/CRISPR KO cells (not si/miRNA KO) to demonstrate that effects induced by AG-205 were due to PGRMC1.