Figure 4.

Cell adhesion and proliferation assays of different scaffolds. (a) SEM images of SMSCs adhesion on cartilage phase of scaffold loaded with or without PDGF or PDA after seeding for 1 d and 7 d. (b) SEM images of SMSC adhesion on interface layer of scaffold after seeding for 1 d and 7 d. (c) Cell proliferation of SMSCs cultured on different scaffolds after 1 d, 3 d, 5 d, and 7 d using a CCK-8 kit. Statistically significant differences are indicated with ^∗P < 0.05 and ^∗∗P < 0.01 compared with control.