Immunogen sequence: MSGHKCYPWD LQDRYAQDKS VVNKMQQKYW ETKQAFIKAT GKKEDEHVVA SDADLDAKLE LFHSIQRTCL DLSKAIVLYQ KRICFLSQEE NELGKFLRSQ GFQDKTRAGK MMQATGKALC FSSQQRLALR NPLCRFHQEV ETFRHRAISD TWLTVNRMEQ. This gene encodes a protein with an arfaptin homology dom