The greatest inhibition of FXa activity was observed with APS-IgG inhibition 9.7 ± 0.89% (mean ± SEM), followed by SLE-IgG (inhibition 7.07 ± 1.28%) whereas HC-IgG gave inhibition of only 2.58 ± 0.6%. This evidence concerns the gene F10 and systemic lupus erythematosus.