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Scanning electron microscopy observation for 7 days and the proliferation ability of hUC-MSCs for 1, 3, 5, 7, and 9 days in the in vitro three-dimensional culture microenvironment. (a) nHAC/PLA (scale bar = 500 μm). (b) hUC-MSCs+nHAC/PLA (scale bar = 50 μm). (c) hUC-MSCs+nHAC/PLA+OMD (scale bar = 50 μm). (d) hUC-MSCs+nHAC/PLA+OMD+rhBMP-7 (scale bar = 50 μm). (e) Proliferation (mean ± SD, n = 8). ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001.
