Immunogen sequence: QGVSLECQSL QLLPGITTLK CEPPQRPQGN PQEVSGPVPH GSAHLQEKNP RDKAVVPVFN PVRSQTLVKT EEETAQAVAA EKWSHLSLTR RNLCGNSAQE TVMSLSPMTE EIVTKDRLFK AKQETSEEME QSGEASGKPN RECAPQIPCS TPIATERTVA HLNTLKDRHP GDLWARMHIS SLEYAAGDIT RKGRKKDKAR VSELLQGLSF SGD