Immunogen sequence: EHRYQQQYLQ PLPLTHYELV TDAFGHRAPD PLRGARDRTP PLLYRDRDRD LYPDSDWVPP PPPVRERSTR TAATSVPAYE PLDSLDRRRD GWSLDRDRGD RDLPSSRDQP RKRRLPEESG GRHLDRSPES DRPRKRHCAP SPDRSPELSS SRDRYNSDND RSSRLLLERP SPIRDRRGSL EKSQGDKRDR KNSASAERDR KHRTTAPTEG KSP