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Schematic of a murine implantation site at gestational day (gd) 6.5 and 11.5. At gd6.5 the decidualization process occurs at the mesometrial side where uNK cells and decidual cells expand and give rise to the decidua basalis. At gd11.5 the mesometrial aggregate of pregnancy (MLAp), decidua basalis, and placenta are all fully formed. NK cells occupy the MLAp and decidua basalis regions, and not the placenta, of the implantation site.
