Fig. 4.

a Percent retention of newly synthesized collagens at 4 or 15 days after seeding on either non-modified (non-mod) or RGD-modified scaffolds (RGD-mod). b Percent retention of newly synthesized proteoglycans at 4 and 15 days after seeding on either non-modified (non-mod) or RGD-modified scaffolds (RGD-mod). Each time point was done in triplicate and three separate experiments were performed (n = 9) and the results pooled and expressed as mean ± SEM. *P < 0.05 indicating a significant difference compared to day 4