NCF2 and systemic lupus erythematosus: Second, NCF2 is a very well-known SLE locus, where multiple studies (Cunninghame Graham et al., 2011; Yin et al., 2020) including ours (Kim-Howard et al., 2014) have reported non-coding and at least 3 independent ethnicity-specific coding variants within NCF2 passing genome-wide significance in Asian/Hispanic (rs13306575), European/African-American (rs17849502) and African-American (rs35937854) populations.