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Morphology and cell surface markers of BM-MSCs at different passages cultured in 5% oxygen condition. (a) Phase contrast images of BM-MSCs at P0, P2, P8, or P13 (×100 with scale bar = 200 μm). (b) The expression of CD29, CD44, Sca-1, CD11b, CD45, and CD19 surface markers of BM-MSCs at P2, P8, or P13 determined by flow cytometry.
