Immunogen sequence: FDAIANIRGE TFFFKGPWFW RLQPSGQLVS PRPARLHRFW EGLPAQVRVV QAAYARHRDG RILLFSGPQF WVFQDRQLEG GARPLTELGL PPGEEVDAVF SWPQNGKTYL VRGRQYWRYD EAAARPDPGY PRDLSLWEGA PPSPDDVTVS NAGDTYFFKG AHYWRFPKNS IKTEPDAPQP MGPNWLDCPA PSSGPRAPRP PKATPVSETC DCQ