Immunogen sequence: SREEARAQEA AEFEEMAAWA LAAGRKVKKE PGLAAEVGSA LKAETPNNWN ATEDQHEPTK PLVRRAGAKS RSRRKKQKKN SRQEAVPWKK PKGINSNSTA NLEDPEVGDA ESMAISEPIK GSRKPCVNKE ELALKKPMAK CAWKGPREPP QDARAEAESP GGASESDQDG GHESPPKKKA VAWVSAKNPA PMRKKKKVSL GPVSYVLVDS EDG