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. 2021 Feb 10;22(4):1767. doi: 10.3390/ijms22041767

Figure 1.

Figure 1

Sites of interaction between fetal-derived trophoblast and maternal immune cells in the pregnant woman. Trophoblast-derived material, entire cells and the multinucleated syncytiotrophoblast layer encounter maternal immune cells at no less than eight main sites. These can be divided into those that interact with systemic maternal immune cells in peripheral blood and peripheral tissues and those that encounter the specialized immune cell populations in the maternal decidua. EVT: extravillous trophoblast; evTB: endovascular trophoblast cells; iEVT: interstitial EVT; IVS: intervillous space; LN: lymph node; LV: lymphatic vessel; MD: maternal decidua; MM: maternal myometrium; MPV: maternal peripheral vessel; MSA: maternal spiral artery: pSTB: primitive syncytiotrophoblast, schCTBs: smooth chorionic cytotrophoblast cells; vSTB: villous syncytiotrophoblast.