Immunogen sequence: MSKRPSYAPP PTPAPATQMP STPGFVGYNP YSHLAYNNYR LGGNPGTNSR VTASSGITIP KPPKPPDKPL MPYMRYSRKV WDQVKASNPD LKLWEIGKII GGMWRDLTDE EKQEYLNEYE AEKIEYNESM KAYHNSPAYL AYINAKSRAE AALEEESRQR QSRMEKGEPY MSIQPAEDPD DYDDGFSMKH TATARFQRNH RLISEILSES VVP