Decidual spiral artery remodeling during early post-implantation period in mice: Investigation of associations with decidual uNK cells and invasive trophoblast

► Spiral artery (SA) remodeling (SAR) is ill-defined but clinically important. ► Timing of SA formation and identification of SAR timing and mode in mice. ► Two types of SAR occur during early mouse postimplantation. ► Both SAR types are not associated with invasive trophoblast proximity. ► One SAR type associated with one SA wall uNK cell parameter change.