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A: Induced MSCs stratified into multilayer structure on AM, H&E (×100) bar 200 µm; B: Cytokeratin 19 positivity (×200) bar 200 µm; C: Cytokeratin 19 positivity (×1000) bar 50 µm. D: Pancytokeratin positivity (×200) bar 100 µm.
