Immunogen sequence: MSHRKFSAPR HGSLGFLPRK RSSRHRGKVK SFPKDDPSKP VHLTAFLGYK AGMTHIVREV DRPGSKVNKK EVVEAVTIVE TPPMVVVGIV GYVETPRGLR TFKTVFAEHI SDECKRRFYK NWHKSKKKAF TKYCKKWQDE DGKKQLEKDF SSMKKYCQVI RVIAHTQMRL LPLRQKKAHL MEIQVNGGTV AEKLDWARER LEQQVPVNQV FGQ