Immunogen sequence: VLRCHRRRKE KLTAVKYTWN GNILSISNKS WDLLIPQASS NNNGNYRCIG YGDENDVFRS NFKIIKIQEL FPHPELKATD SQPTEGNSVN LSCETQLPPE RSDTPLHFNF FRDGEVILSD WSTYPELQLP TVWRENSGSY WCGAETVRGN IHKHSPSLQI HVQRIPVSGV LLETQPSGGQ AVEGEMLVLV CSVAEGTGDT TFSWHREDMQ ESL