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Relative mRNA expression level of MG63 cells (opn (a), collagen 1 (b), runx2 (c), and sp7 (d)) and HUVEC cells (vegf (e) and ramp2 (f)) of the PLGA/nHA/CMs/ADM, PLGA/nHA, and control groups (normal cells without treatment) at predetermined times. *P < 0.05 indicates statistically significant difference compared with the control group (n = 6).
