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Macroscopic and microscopic pictures of trophoblast cells. (A) Cultured trophoblasts from a representative experiment (donor QH1) are shown. CTB were evaluated by (B) light microscopy or (C) after May Grunwald-Giemsa staining. The cells form a dense cluster, are rounded in structure and adhere to the plate. (D) Cells at the EVT stage have a more spindle-shaped appearance.
