Proximal Core control elements promoter Start of transcription RNA Poly(A)site GC box CAAT box TATA box Inr Exon1 Exon 2 Exon 3 DNA GGGCGG GCCCAATCT TATAAA Intron Intron -100 -80 -25 5'untranslated 3'untranslated region (leader) region(trailer) Copyright2003 Pearson Education.Inc.publishing as Banjamin Cummings