Immunogen sequence: MEDAKVYVAK VDCTAHSDVC SAQGVRGYPT LKLFKPGQEA VKYQGPRDFQ TLENWMLQTL NEEPVTPEPE VEPPSAPELK QGLYELSASN FELHVAQGDH FIKFFAPWCG HCKALAPTWE QLALGLEHSE TVKIGKVDCT QHYELCSGNQ VRGYPTLLWF RDGKKVDQYK GKRDLESLRE YVESQLQRTE TGATETVTPS EAPVLAAEPE ADK