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Relative levels of bone marker expression in nanofibrous and solid-walled scaffolds after 2 and 6 weeks of culture under differentiation conditions. (A) osteocalcin (OCN) expression; (B) bone sialoprotein (BSP) expression; and (C) type I collagen (COL) expression. From Chen et al.[39] Copyright © 2006 by Elsevier. Reprinted with permission of Elsevier.
