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Primary sheep trophoblast cells and immortalized sheep trophoblast cells under phase contrast microscopy. (a) Primary STCs at passage 2; (b) multinucleated syncytiotrophoblast from primary STCs; (c) hTERT-STCs at passage 50; and (d) binucleate trophoblast cells from hTERT-STCs (scale bars, 50 μm). hTERT-STCs: human telomerase reverse transcriptase-sheep trophoblast cell line.
