Immunogen sequence: MSAPAAKVSK KELNSNHDGA DETSEKEQQE AIEHIDEVQN EIDRLNEQAS EEILKVEQKY NKLRQPFFQK RSELIAKIPN FWVTTFVNHP QVSALLGEED EEALHYLTRV EVTEFEDIKS GYRIDFYFDE NPYFENKVLS KEFHLNESGD PSSKSTEIKW KSGKDLTKRS SQTQNKASRK RQHEEPESFF TWFTDHSDAG ADELGEVIKD DIW