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Constant-current topography images of (A) boar sperm cell, (B and C) differentiated PC12, (D) A431 cell, (E) cardiac myocyte, and (F) hair cells. The carbon electrode was held at -500 mV vs. Ag/AgCl in PBS containing 10 mM Ru(NH3)6Cl3 [diffusion-limited reduction of 
]. The electrode radii are (A) 395.1 nm, (B and C) 18.9 nm, (D) 61.8 nm, (E) 12.0 nm, (F) 70.4 nm, respectively.
