Immunogen sequence: PTVCCNPYHF SRLCGPESPP PPYSRLSPRD EYKPLDLSDS TLSYTETEAT NSLITAPGEF SDASMSPDAT KPSHWCSVAY WEHRTRVGRL YAVYDQAVSI FYDLPQGSGF CLGQLNLEQR SESVRRTRSK IGFGILLSKE PDGVWAYNRG EHPIFVNSPT LDAPGGRALV VRKVPPGYSI KVFDFERSGL QHAPEPDAAD GPYDPNSVRI SFA