Figure 5. PC12 cell proliferation on a poly-L-lysine coated Si₃N₄ surface.

PC12 cells expressing DsRed2 protein were seeded at a concentration of 7×10⁴ cells/ml on poly-L-lysine coated Si₃N₄ surfaces and images were captured every 2 days using a fluorescence microscope. (A) 3 days, (B) 5 days, (C) 7 days and (D) 9 days after cell seeding. Scale bar: 100 µm.