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Recognition of anti-phospholipid (aPL) antibodies is specificity-dependent upon beta-2 glycoprotein I (β2GPI) co-factor (CF) for detection. Phospholipid-specific assays were designed with (CF+) or without (CF−) β2GPI CF and assessed for antibody reactivity in all the study participants. The bars represent the percentage of positive individuals in each group.
