GRIN2B and systemic lupus erythematosus: According to one study, the percentage of anti NR2A/B antibodies in NPSLE varied in different studies, but in another study it was found that these antibodies were present in 81% of the SLE patients with diffuse NPSLE and in 41% with focal NPSLE [14]. Following a study conducted by Park et al. [15], an interesting correlation between anti NMDAR antibodies against GluN2B subunits and fibromyalgia in SLE patients has been noted [15].