(a)
(b)
Figure 7: (a) A representative image of Alizarin Red S-stained cell clusters on the surface of no CNTs silicone-collagen film. (b) Absorbance spectroscopy at 490 nm (red intensity) of DMSO-solubilized Alizarin Red S-calcium crystals on composites with high CNTs and no CNTs, with applied electrical stimulation (with current) and without it (no current control). for high CNTs versus no CNTs at a no current condition.