513680.fig.004a
(a)   Mesenchymal stem cells
513680.fig.004b
(b) Mesenchymal stem cells
513680.fig.004c
(c) Osteoblast cells
513680.fig.004d
(d) Osteoblast cells
Figure 4: Comparative graphs showing the influence of nanotube diameter on cell number and elongation at early incubation time points. MSC cell number versus incubation time (a) and MSC elongation (length to width ratio) as a function of nanotube diameter at 2 and 24 h (b). Osteoblast cell number versus incubation time on each substrate (c) and osteoblast cell elongation as a function of nanotube diameter at 2 and 24 h (d).