Immunogen sequence: MGKKSRAVPG RRPILQLSPP GPRGSTPGRD PEPEPDTEPD STAAVPSQPA PSAATTTTTA VTAAAASDDS PSEDEQEAVQ EVPRVVQNPP KPVMTTRPTA VKATGGLCLL GAYADSDDDD NDVSEKLAQS KETNGNQSTD IDSTLANFLA EIDAITAPQP AAPVGASAPP PTPPRPEPKE AATSTLSSST SNGTDSTQTS GWQYDTQCSL AGV