title: Importance of helical periodicity.
mesh_terms: D004742:Enhancer Elements, Genetic; D005786:Gene Expression Regulation; D005809:Genes, Regulator; D009690:Nucleic Acid Conformation; D011401:Promoter Regions, Genetic; D012319:RNA Polymerase II / Q000378:metabolism; D013539:Simian virus 40 / Q000235:genetics; D014157:Transcription Factors; D014158:Transcription, Genetic
chemical_list: D014157:Transcription Factors; D012319:RNA Polymerase II