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Benefit of NMN on osteoblastic differentiation. The mRNA levels of genes of OPN (a), Runx2 (b), Osterix (c), osteocalcin (OCN, d), and Col1a1 (e) and activities of ALP (f) were shown. * P < 0.05 vs. group cultured under normal gravity (NG) and treated with vehicle; # P < 0.05 vs. group cultured under microgravity (MG) and treated with vehicle
