Immunogen sequence: HGVCYTRGLS VRSILAELTG RRGGCAKGKG GSMHMYTKNF YGGNGIVGAQ GPLGAGIALA CKYKGNDEIC LTLYGDGAAN QGQIAEAFNM AALWKLPCVF ICENNLYGMG TSTERAAASP DYYKRGNFIP GLKVDGMDVL CVREATKFAA NYCRSGKGPI LMELQTYRYH GHSMSDPGVS YRTREEIQEV RSKRDPIIIL QDRMVNSKLA TVE