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Immunohistochemistry of AFP, VEGF, TF, TUBB1 and MT1G to detect cellular localization. All proteins were found located in either the cytoplasm or cytomembrane of syncytiotrophoblasts and cytotrophoblast cells in the placental villi tissues obtained from control group. Scale bar, 10 µm. AFP, α-fetoprotein; VEGF, vascular endothelial growth factor; TF, transferrin; TUBB1, tubulin β1 class VI; MT1G, metallothionein 1G; IVF-ET, in vitro fertilization and embryo transfer.
