Immunogen sequence: SKSSWGLENE ALIVRCPQRG RSTYPVEWYY SDTNESIPTQ KRNRIFVSRD RLKFLPARVE DSGIYACVIR SPNLNKTGYL NVTIHKKPPS CNIPDYLMYS TVRGSDKNFK ITCPTIDLYN WTAPVQWFKN CKALQEPRFR AHRSYLFIDN VTHDDEGDYT CQFTHAENGT NYIVTATRSF TVEEKGFSMF PVITNPPYNH TMEVEIGKPA SIA