Immunogen sequence: KFASCVDASG GLKCHRSFMG SRFIEVMQGS EQQWIEFGGN AVKEGDVLRR SEEHSPPRGI NDRHFRKRSH SKSPRRTRSR SPLGFYVHLK NLSLSIDERD LRNFFRGTDL TDEQIRFLYK DENRTRYAFV MFKTLKDYNT ALSLHKTVLQ YRPVHIDPIS RKQMLKFIAR YEKKRSGSLE RDRPGHVSQK YSQEGNSGQK L; Positive Sa