(a) Mesenchymal stem cells
(b) Osteoblast cells
Figure 6: Comparative graphs showing the trend of MSC and osteoblast cell functionality with increasing nanotube diameter. (a) Quantitative PCR analysis for ALP, OCN, and OPN after 3 week mesenchymal stem cell culture. Plastic cell culture plate with osteogenic inducing media was used as a positive control for osteogenic differentiation. (b) ALP activity after 24 and 48 h of osteoblast incubation.