DDB2 and xeroderma pigmentosum: The GG-NER-specific complexes (xeroderma pigmentosum complementation group C [XPC] in complex with the human homologue of Rad23 [hHR23B/A], and xeroderma pigmentosum complementation group E [XPE/DDB2] in complex with the UV-damaged DNA binding protein 1, [UV-DDB1]) recognize lesions at any position in the genome [5].