Immunogen sequence: VKCHFDYNPY NDNLIPCKEA GLKFSKGEIL QIVNREDPNW WQASHVKEGG SAGLIPSQFL EEKRKAFVRR DWDNSGPFCG TISSKKKKKM MYLTTRNAEF DRHEIQIYEE VAKMPPFQRK TLVLIGAQGV GRRSLKNRFI VLNPTRFGTT VPFTSRKPRE DEKDGQAYKF VSRSEMEADI KAGKYLEHGE YEGNLYGTKI D; Positive Sa