Immunogen sequence: NPYTLYTFRI RCSTETFWKW SKWSNKKQHL TTEASPSKGP DTWREWSSDG KNLIIYWKPL PINEANGKIL SYNVSCSSDE ETQSLSEIPD PQHKAEIRLD KNDYIISVVA KNSVGSSPPS KIASMEIPND DLKIEQVVGM GKGILLTWHY DPNMTCDYVI KWCNSSRSEP CLMDWRKVPS NSTETVIESD EFRPGIRYNF F; Positive Sa