CXCR1 and systemic lupus erythematosus: Further transcripts with elevated expression in SLE included IL-1α and β, IL-1 receptor 2 (IL1R2), and IL1R accessory protein (IL1RAP), IL-8 and its receptors IL8RA (CXCR1) and IL8RB (CXCR2), FcγR1 (CD64), urokinase R (CD87), PBEF, and PD-ECGF.