HBB and systemic lupus erythematosus: They did not perform clustering analysis on their cohort; however, identified 23 common proteins between the 2 SLE groups compared to HC, five of these (ORM1, antithrombin‐III [SERPINC1], ceruloplasmin, haemoglobin subunit beta [HBB] and delta [HBD]) were significantly upregulated in patients with lupus nephritis.