Figure 4.

SEM images presenting chondrocytes (bearing magnetic nanoparticles) grown on the biphasic type II collagen–chitosan/polylactic-co-glycolic acid (CLG–CS/PLGA) scaffold at 1, 7, and 14 days after seeding. (A) No attachment of the cells on the scaffold after one day was observed, only their collection on the scaffold surface was indicated, (B) after seven days, cells started to adhere and proliferate deep into the scaffold, (C) after 14 days, the extracellular matrix was secreted with a higher accumulation on the scaffold surface. Cell adhesion and spreading on the pores of the scaffold is clearly visible. Magnification 500×. Adapted from [93], MDPI, 2017.