Immunogen sequence: MSAVGAATPY LHHPGDSHSG RVSFLGAQLP PEVAAMARLL GDLDRSTFRK LLKFVVSSLQ GEDCREAVQR LGVSANLPEE QLGALLAGMH TLLQQALRLP PTSLKPDTFR DQLQELCIPQ DLVGDLASVV FGSQRPLLDS VAQQQGAWLP HVADFRWRVD VAISTSALAR SLQPSVLMQL KLSDGSAYRF EVPTAKFQEL RYSVALVLKE MAD