Immunogen sequence: QHDGSITASL TESKSAHVQT QTGQNSIPAL AQVAAIAETD ESAESEGVID SHKRREILSR RPSYRKILNE LSSDVPGVPK IEEERSEEEG TPPSIATMAV PTSIYQTSTG QYIAIAQGGT IQISNPGSD. This gene encodes a bZIP transcription factor that binds to the cAMP responsive element fou