title: Absence of long pyrimidine tracts in cytosine-rich repeating units present in Escherichia coli DNA.
mesh_terms: D001483:Base Sequence; D002848:Chromatography, DEAE-Cellulose; D003596:Cytosine / Q000032:analysis; D004269:DNA, Bacterial / Q000032:analysis*; D004926:Escherichia coli / Q000032:analysis*; D009841:Oligonucleotides / Q000032:analysis; D011743:Pyrimidines / Q000032:analysis
chemical_list: D004269:DNA, Bacterial; D009841:Oligonucleotides; D011743:Pyrimidines; D003596:Cytosine