Immunogen sequence: CQCYPKITFV PADSDFQGIL SPKAMGLLEN GLAAEMKSPS PQPPYVRLWE EAAYDQSLPD FSHIQMKVMS YSEDHRSLLA PEMGQPKLGT SDGGEGGPGD VQAWMEAAVV IHKGSDESEG ERRLTQSWPG PLACPQGPAP LASFQDDLDM DSSEGSSPNA SPHDREEACS PQQEPQGCRC PLDRFQDFAL IDAPTLEDEP QEGQQWEIAL PNN