Immunogen sequence: LPYYIGISID SFILLEIIKQ GCEFENTVHK WISITEALAF FHCCLNPILY AFLGAKFKTS AQHALTSVSR GSSLKILSKG KRGGHSSVST ESESSSFHSS. CXCR4 (Fusin, LESTR, HUMSTR) is a member of the G-protein-coupled chemokine receptor family with seven membrane-spanning do