Immunogen sequence: MKFRAKITGK GCLELFIHVS GTVARLAKVC VLRVRPDSLC FGPAGSGGLH EARLWCEVRQ GAFQQFRMEG VSEDLDEIHL ELTAEHLSRA ARSAAGASSL KLQLTHKRRP SLTVAVELVS SLGRARSVVH DLPVRVLPRR VWRDCLPPSL RASDASIRLP RWRTLRSIVE RMANVGSHVL VEANLSGRMT LSIETEVVSI QSYFKNLGNP PQS