Effect of intrauterine PGF or PBS treatment on steady-state mRNA concentrations for A) VEGFA (vascular endothelial growth factor A), B) FGF2 (fibroblast growth factor 2). Data are shown as fold changes ± SEM. Columns with different letters (a, b, c) at each biopsy indicate differences, P < 0.05. First, second, third, and fourth indicate biopsy times.