Immunogen sequence: SPPLDDNKIP SLCPGHPGLP GTPGHHGSQG LPGRDGRDGR DGAPGAPGEK GEGGRPGLPG PRGDPGPRGE AGPAGPTGPA GECSVPPRSA FSAKRSESRV PPPSDAPLPF DRVLVNEQGH YDAVTGKFTC QVPGVYYFAV HATVYRASLQ FDLVKNGESI ASFFQFFGGW PKPASLSGGA MVRLEPEDQV WVQVGVGDYI GIYASIKTDS TFS