Immunogen sequence: MEPNDSTSTA VEEPDSLEVL VKTLDSQTRT FIVGAQMNVK EFKEHIAASV SIPSEKQRLI YQGRVLQDDK KLQEYNVGGK VIHLVERAPP QTHLPSGASS GTGSASATHG GGSPPGTRGP GASVHDRNAN SYVMVGTFNL PSDGSAVDVH INMEQAPIQS EPRVRLVMAQ HMIRDIQTLL SRMECRGGPQ PQHSQPPPQP; Positive Samp