Immunogen sequence: AKILTISTVG GSHYLLMDRV SQILQDHGHN VTMLNHKRGP FMPDFKKEEK SYQVISWLAP EDHQREFKKS FDFFLEETLG GRGKFENLLN VLEYLALQCS HFLNRKDIMD SLKNENFDMV IVETFDYCPF LIAEKLGKPF VAILSTSFGS LEFGLPIPLS YVPVFRSLLT DHMDFWGRVK NFLMFFSFCR RQQHMQSTFD NTIKEHFTEG SRP