Immunogen sequence: MFRRKLTALD YHNPAGFNCK DETEFRNFIV WLEDQKIRHY KIEDRGNLRN IHSSDWPKFF EKYLRDVNCP FKIQDRQEAI DWLLGLAVRL EYGDNAEKYK DLVPDNSKTA DNATKNAEPL INLDVNNPDF KAGVMALANL LQIQRHDDYL VMLKAIRILV QERLTQDAVA KANQTKEGLP VALDKHILGF DTGDAVLNEA AQILRLLHIE ELR