Immunogen sequence: SATLNAELFS DYFNSCPVIT IPGRTFPVDQ FFLEDAIAVT RYVLQDGSPY MRSMKQISKE KLKARRNRTA FEEVEEDLRL SLHLQDQDSV KDAVPDQQLD FKQLLARYKG VSKSVIKTMS IMDFEKVNLE LIEALLEWIV DGKHSYPPGA ILVFLPGLAE IKMLYEQLQS NSLFNNRRSN RCVIHPLHSS LSSEEQQAVF V; Positive Sa