NER in E. coli continued
	two single strand nicks are placed to the 3' side of the dimer (4 to 5 nucleotides) and to the 5' side of the dimer (8 nucleotides) helicase II (uvrD) unwinds 12 - 13 b fragment containing the dimer, ATP hydrolysis required DNA polymerase I fills in the gap dNTPs required DNA ligase seals the single strand break ATP hydrolysis to AMP required