Immunogen sequence: VMKKRRNDCS QKLGVALMMA QEAEQISIQE RVNLFGFWSR FNGSNSNGER KDLQLSGLNS PGSCLEKKEK EEELEKEEGE KTDPILPIRK RVKIQTQKTK PRGLGGDAGT ADGRGRTLQR KIMKRSLGRK STAPPAPRMG RKEGQGNSDS DQPGPKKKFK APQSKALAAS FSEGKEVRTV PKNLGLSACK GACPSSAKEE PRHREPLTQE AGS