SNRPD1 and systemic lupus erythematosus: Incaprera et al. found that a high degree of homology between the EBNA-2 354GRGKGKSRDKQRKPGGPWRP373 subsequence and the antigenic C-terminal domain 101GRGRGRGRGRGRGRGGPRR119 of the SmD1 ribonucleoprotein, a target of autoantibodies in a portion of SLE patients [30].