Nevertheless, SLE patients with low C4 levels (<0.1 g/l) also had lower RvD1 plasma levels, 36.05 pg/ml (29.55–42.45), compared to patients with normal (>0.1 g/l) C4 levels of 52.2 pg/ml (43.4–61.8), p = 0.0087, as reported in Figure 3. This evidence concerns the gene C4A and systemic lupus erythematosus.