title: Sigma factors in multitude.
mesh_terms: D001419:Bacteria / Q000235:genetics*; D005786:Gene Expression Regulation; D011401:Promoter Regions, Genetic; D012808:Sigma Factor / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D012808:Sigma Factor; D014157:Transcription Factors