Some other studies, however, showed that expression of CXCR4 remained unchanged (Amoura et al., 2003) or was decreased in all memory T cell subtypes from lupus patients compared to controls (Fritsch et al., 2006; Chong and Mohan, 2009; Biajoux et al., 2012). The gene discussed is CXCR4; the disease is systemic lupus erythematosus.