Immunogen sequence: NIVHYDCHLA AVRLARGREE WESAALQNAN TKCNGLLPVW GPHVPESAFA TCLARHNTYL QECTGQREPT YQLNIHDIKL LFLRFAMEQS FSADTGGGGR ESNIHLIPYI IHTVLYVLNT TRATSREEKN LQGFLEQPKE KWVESAFEVD GPYYFTVLAL HILPPEQWRA TRVEILRRLL VTSQARAVAP GGATRLTDKA VKDYSAYRSS LLF