Immunogen sequence: MATAATEEPF PFHGLLPKKE TGAASFLCRY PEYDGRGVLI AVLDTGVDPG APGMQVTTDG KPKIVDIIDT TGSGDVNTAT EVEPKDGEIV GLSGRVLKIP ASWTNPSGKY HIGIKNGYDF YPKALKERIQ KERKEKIWDP VHRVALAEAC RKQEEFDVAN NGSSQANKLI KEELQSQVEL LNSFEKKYSD PGPVYDCLVW HDGEVWRACI DSN