Excision endonuclease, also known as excinuclease or UV-specific endonuclease, is a nuclease (enzyme) which excises a fragment of nucleotides during DNA repair. The excinuclease cuts out a fragment by hydrolyzing two phosphodiester bonds, one on either side of the lesion in the DNA.
Excision endonuclease, also called excinuclease or UV-specific endonuclease, is an enzyme that removes a section of nucleotides during DNA repair. It cuts out this fragment by breaking two phosphate-sugar bonds, one on each side of the damaged site in the DNA molecule.