The goal of this study is to learn more about lupus (Systemic Lupus Erythematosus; SLE), which affect African-Americans more than other groups. The purpose of this study is to understand what role microbes living in the intestine (called microbiota) have in causing lupus. This study will include African-Americans who have SLE, individuals who have immediate family members with SLE and unrelated healthy volunteers. For study subject recruitment, CCCR/MCRC databases including the longitudinal SLE in Gullah Health (SLEIGH) study as well as the chart review will be used to screen for eligibility. The study is sponsored by the National Institutes of Health.