For example, the broad-spectrum antiviral potential of ddhCTP, a product of Viperin’s enzymatic activity, its novel function in tumor immunity, and the association of its overactivation with autoimmune diseases, such as systemic lupus erythematosus [15,16], suggest that it holds great promise as a therapeutic target. The gene discussed is RSAD2; the disease is systemic lupus erythematosus.