fully protected 42±2bp: partially protected 51±4bp bp
||Cow Bos Taurus
||Rice GA, Chamberlin MJ, Kane CM. Contacts between mammalian RNA polymerase II and the template DNA in a ternary elongation complex. Nucleic Acids Res. 1993 Jan 11 21(1):113-8. p.116 right column 2nd paragraphPubMed ID8441606
||Abstract: "[Investigators] have prepared and isolated complexes of purified RNA polymerase II halted at defined positions along a DNA template, and [they] have used deoxyribonuclease I (DNAse I) to map the interactions of the polymerase with the DNA template."
||P.116 right column 2nd paragraph: "These asymmetric changes in the DNAse I footprint during elongation result in modest changes in the total size of the protected region. The polymerase fully protects 42±2bp of the DNA. When the partial protection is included, this distance extends to 51±4bp of protection."