FIGURE 2 Antibody titer ratios and bleeding severities. (a) The antibody titer ratios of anti-GPIIb/IIIa antibodies in plasma. (b) The antibody titer ratios of anti-GPIIb/IIIa antibodies in eluent. (c)The antibody titer ratios of anti-GPIb/IX antibodies in plasma. (d)The antibody titer ratios of anti-GPIb/IX antibodies in eluent.