Figure 2.

Immunohistochemistry of kynurenine at the maternal-fetal interface of human placenta. Immunostaining for kynurenine, indoleamine 2,3-dioxygenase-1 (IDO1), indoleamine 2,3-dioxygenase-2 (IDO2), rabbit-isotype control, and mouse-isotype control were performed as described in the section “Materials and Methods.” (A) Implantation site of 7 weeks of gestation. (B) Term chorionic villi and placental bed. The results presented are from a single representative experiment performed with one 7 weeks sample and 5 term placentas. Scale bars represent 100 µm.