Immunogen sequence: ENSDDYDLMY VNLDNEIDNG LHPTEDPTPC ACGQEHSEWD KLFIMLENSQ MRERMLLQAT DDVLRGELQR LREELGRLAE SLARPCAPGA PAEARLTSAL DELLQATRDA GRRLARMEGA EAQRPEEAGR ALAAVLEELR QTRADLHAVQ GWAARSWLPA GCETAILFPM RSKKIFGSVH PVRPMRLESF SACIWVKATD VLNKTILFSY GTK