Immunogen sequence: NVCGSQQGRG QCTEVRADTR PWSGPYILRN QDDRELWPRK FFHRTCKCTG NFAGYNCGDC KFGWTGPNCE RKKPPVIRQN IHSLSPQERE QFLGALDLAK KRVHPDYVIT TQHWLGLLGP NGTQPQFANC SVYDFFVWLH YYSVRDTLLG PGRPYRAIDF SHQGPAFVTW HRYHLLCLER DLQRLIGNES FALPYWNFAT GRNECDVCTD QLF