Figure 3.

Anti‐glucose‐modified β₂glycoprotein I (G‐β₂GPI) antibodies in patients and healthy subjects. Sera from patients with anti‐phospholipid antibody syndrome (PAPS) and APS associated with systemic lupus erythematosus (SLE) (SAPS), SLE, rheumatoid arthritis (RA) and of healthy subjects were analysed by enzyme‐linked immunosorbent assay (ELISA) for the detection of anti‐G‐β₂GPI immunoglobulin (Ig)G. All the sera from RA patients and healthy subjects were negative for anti‐G‐β₂GPI IgG antibodies. The horizontal line shows the cut‐off level calculated as mean optical density (OD) value in control healthy subjects’ sera ± 3 standard deviations (s.d.).