Immunogen sequence: QVSQQLQQTN RVLEVTNSSL RQQLRLKITQ LGQSAEDLQG SRRELAQSQE ALQVEQRAHQ AAEGQLQACQ ADRQKTKETL QSEEQQRRAL EQKLSNMENR LKPFFTCGSA DTCCPSGWIM HQKSCFYISL TSKNWQESQK QCETLSSKLA TFSEIYPQSH SYYFLNSLLP NGGSGNSYWT GLSSNKDWKL TDDTQRTRTY AQSSKCNKVH KTW