Fig. 4From: Biocompatibility and magnetic resonance imaging characteristics of carbon nanotube yarn neural electrodes in a rat modelMacrophage activation (CD68-positive density) at 1, 6, and 12 weeks around CNTY and control Pt–Ir electrodes. a CD68-positive celldensity 1 week after implantation. **P < 0.01. b CD68-positive celldensity 6 weeks after implantation. *P < 0.05; **P < 0.01. c CD68-positive celldensity 12 weeks after implantation. **P < 0.01Back to article page