Immunogen sequence: PFEVNMEETI YQNYQRIRIQ ESPGKVAAGR LPRSKDAILL ADLVDSCKPG DEIELTGIYH NNYDGSLNTA NGFPVFATVI LANHVAKKDN KVAVGELTDE DVKMITSLSK DQQIGEKIFA SIAPSIYGHE DIKRGLALAL FGGEPKNPGG KHKVRGDINV LLCGDPGTAK SQFLKYIEKV SSRAIFTTGQ GASAVGLTAY VQRHPVSREW TLE