The chemokine receptor CXCR3, for example, is a potential drug target for several immune-related diseases, such as allograft rejection [6], atherosclerosis [7], psoriasis [8], multiple sclerosis [9, 10], rheumatoid arthritis [11], and type I diabetes [12] where aberrant CXCR3 and ligand expression seems to be a common denominator [13, 14]. The gene discussed is CXCR3; the disease is multiple sclerosis.