Immunogen sequence: DFKVLPQEAE EERWYLAAQV AVARGPLLFS GALSEGQFYS PPESFAGSDN ESDEEVAGKK SFSAQEREYI RQGKEATAVV DQILAQEENW KFEKNNEYGD TVYTIEVPFH GKTFILKTFL PCPAELVYQE VILQPERMVL WNKTVTACQI LQRVEDNTLI SYDVSAGAAG GVVSPRDFVN VRRIERRRDR YLSSGIATSH SAKPPTHKYV RGE