<p>Serum samples were obtained from each mouse group on day 56, and IgG anti-β2-GPI antibody levels were analyzed by ELISA. The data are presented as the means ± standard deviation of triplicate assays from six mice/group. <sup>ns</sup>p>0.05, *p < 0.05, ** p < 0.01 versus the control APS group.</p