Immunogen sequence: MMLQHPGQVS ASEVSASAIV PCLSPPGSLV FEDFANLTPF VKEELRFAIQ NKHLCHRMSS ALESVTVSDR PLGVSITKAE VAPEEDERKK RRRERNKIAA AKCRNKKKEK TEC. ATF3 (Activating transcription factor 3) is a member of the mammalian activation transcription factor/cAMP r