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Alizarin Red staining. a PMSCs (white arrows) seeded in 6-well plate and treated with osteogenic differentiation medium as positive control. Scale bar 50 μm. b PMSCs (white arrows) seeded on PCEC nanofibers and treated with osteogenic differentiation medium showed positive staining to Alizarin Red S after 2 weeks of culture. Scale bar 50 μm
