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Summary of immunohistochemical results in first trimester and term placentas and extraplacental membranes. +, Presence of the protein; +/−, variable presence of the protein; −, the absence of the protein. cTB, cytotrophoblast; evTB, extravillous trophoblast; IVS, intervillous space; Mϕ, macrophages; sTB, syncytiotrophoblast.
