Immunogen sequence: QETDSVVSSV TTKVKGVAVT NTSKLGFRIW DVADYVIPAQ EENSLFVMTN VILTMNQTQG LCPEIPDATT VCKSDASCTA GSAGTHSNGV STGRCVAFNG SVKTCEVAAW CPVEDDTHVP QPAFLKAAEN FTLLVKNNIW YPKFNFSKRN ILPNITTTYL KSCIYDAKTD PFCPIFRLGK IVENAGHSFQ DMAVEGGIMG IQVNWDCNLD RAA