Figure 1 Serum levels of mannan‐binding lectin (MBL) for the high MBL (A/A) and low MBL (0/0, LXA/0, HYA/0, LYA/0) genotypes compared in the patients with systemic lupus erythematosus (white), relatives (light grey) and controls (dark grey) using analysis of variance on ranks. Box plots show the median values and interquartiles, and the bars show the 10th centiles of MBL concentrations. Most people carrying high MBL genotypes had MBL levels >1000 μg/l, whereas those carrying low MBL genotypes had MBL levels <1000 μg/l.