Fig. 7. KiSS-1 and KiSS-1R mRNA and protein expression in first trimester placenta. The histology of the maternal-fetal interface and KiSS-1 (A) and KiSS-1R (B) expression patterns are shown schematically from in situ hybridization and immunohistochemistry staining (Fig. 4). AV, anchoring villus; evCT: extravillous cytotrophoblast; ST, syncytiotrophoblast; vCT, villous cytotrophoblast.