Clinical investigators in the Center for Human Immunology, Autoimmunity, and Inflammatory Diseases (CHI) study the pathophysiology of a wide variety of immune-mediated and inflammatory diseases. One of the goals of the CHI is to better understand these diseases and to refine therapeutic approaches used in their management based on knowledge of the underlying pathophysiologies. This requires samples from patients with immune-mediated and inflammatory diseases for such clinical and laboratory assessments. Collection of samples from family members is necessary to identify genetic components of specific conditions.