Immunogen sequence: DSKKHTGYVG LKNQGATCYM NSLLQTLFFT NQLRKAVYMM PTEGDDSSKS VPLALQRVFY ELQHSDKPVG TKKLTKSFGW ETLDSFMQHD VQELCRVLLD NVENKMKGTC VEGTIPKLFR GKMVSYIQCK EVDYRSDRRE DYYDIQLSIK GKKNIFESFV DYVAVEQLDG DNKYDAGEHG LQEAEKGVKF LTLPPVLHLQ LMRFMYDPQT DQN