Immunogen sequence: IASDNWSTAT KITTIPNVKK IGKVVGFAFR RGNISSFHSF LQNLHLLPSD SHKLLHEYAM HLSACAYVKD TDLSQCIFNH SQRTLAYKAN KAIERNFVMR NDFLWDYAEP GLIHSIQLAV FALGYAIRDL CQARDCQNPN AFQPWELLGV LKNVTFTDGW NSFHFDAHGD LNTGYDVVLW KEINGHMTVT KMAEYDLQND VFIIPDQETK NEF