HomeVascular endothelial expression of indoleamine 2,3-dioxygenase 1 forms a positive gradient towards the feto-maternal interface August 16, 2011 print this article Vascular endothelial expression of indoleamine 2,3-dioxygenase 1 forms a positive gradient towards the feto-maternal interface Blaschitz et al.; PLoS One. 2011;6(7):e21774