RPLP1 and systemic lupus erythematosus: Another study on neuropsychiatric lupus erythematosus (hereinafter referred to as NPSLE) and SLE showed that the positive rates of RPLP0, RPLP1, RPLP2, and SS-A autoantibodies in the NPSLE group were significantly higher than those in the non-NPSLE group or control group.