Double incision at the damaged DNA strand excises the oligonucleotide that contains the lesion from the open bubble. The excised oligonucleotide is ~27-30 bases long. Incision 5' to the damage site, by ERCC1:ERCC4 endonuclease, precedes the incision 3' to the damage site by ERCC5 endonuclease (Staresincic et al. 2009).
Staresincic, L, Fagbemi, AF, Enzlin, JH, Gourdin, AM, Wijgers, N, Dunand-Sauthier, I, Giglia-Mari, G, Clarkson, SG, Vermeulen, W, Schärer, OD
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