SELPLG and systemic lupus erythematosus: In the present study we found that the expression of PSGL-1 is reduced in neutrophils from SLE patients during disease activity (Figure 1a) and that low PSGL-1 expression in neutrophils associates with the presence of anti-dsDNA antibodies (Figure 1b), which in turn associates with disease activity (Table 1 and Table 2).