Relationship of anti-Sm with anti-NR2 in NPSLE. In upper panels, correlation between cerebrospinal fluid (CSF) anti-NR2 and CSF anti-Sm was evaluated. In lower panels, correlation between serum anti-NR2 and serum anti-Sm was evaluated. Statistical analysis was carried out by Spearman’s rank correlation test. NPSLE: neuropsychiatric systemic lupus erythematosus.