Polarization curves of 0.103 M NaCl solution containing (a) 2 vol% to 30 vol% FBS, (b) 20 vol% to 80 vol% FBS, and (c) icorr and Ecorr values extracted from polarization curves. The vol% of plasma (serum) in human blood53 and FBS used in most in vitro studies are marked in the figure.8