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Morphology of placenta derived mesenchymal stem cells (PMSCs). a After initial culturing for 72 h, fibroblast-like cells migrated out from the enzyme-digested placenta tissues and fibroblastic colony formation could be observed Scale bar 200 μm. b Cells prominently displayed a fibroblast-like or vortex-shaped morphology after 2 passages of cultivation. Scale bar 200 μm
