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Human placenta. a. Macrograph of a placenta at term pregnancy. b. Placental villi. HE stain. Bar=75 µm. c. Surface of the basal plate with extravillous cytotrophoblast invasion and fibrinoid deposition. HE stain. Bar=150 µm. AV, anchoring villus; EC, extravillous cytotrophoblast; Fi, fibrinoid; FV, fetal vessel; IVS, intervillous space; St, syncytiotrophoblast.
