NewslettersEndothelial Cell News Mouse Placenta Fetal Macrophages Arise from Endothelial Cells outside the Placenta By Noshin Noorjahan - December 5, 2022 0 Using a new Hoxa13Cre allele that labeled all placental endothelial cells, investigators demonstrated that mouse placental fetal macrophages did not arise from placental endothelium. [Developmental Cell] Abstract