Blood viscosity was measured at increasing shear rates with various concentrations of PEG or P188. All data points represent n = 4. Error bars represent SEM. Statistical significance (p < 0.05) denoted as: *comparing PEG and P188 at shear rate 0.1 s−1; †comparing shear rate 0.1 s−1 vs. 1, 10, and 100 s−1 for PEG; ††comparing shear rate 0.1 s−1 vs. 1, 10, and 100 s−1 for P188; #comparing shear rate 1 s−1 vs. 10 and 100 s−1 for PEG and P188; and ##comparing shear rate 0.1 s−1 vs. 100 s−1 for PEG. Abbreviations as in Figure 1.