Immunogen sequence: PDDSAIFSAA KDCSIIKWSV ESGRKLHVIP RAKKGAEGKP PGHSSHVLCM AISSDGKYLA SGDRSKLILI WEAQSCQHLY TFTGHRDAVS GLAFRRGTHQ LYSTSHDRSV KVWNVAENSY VETLFGHQDA VAALDALSRE CCVTAGGRDG TVRVWKIPEE SQLVFYGHQG SIDCIHLINE EHMVSGADDG SVALWGLSKK RPLALQREAH GLR