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/ercc sequence xpbc /ercc gene promoter sug 1 transcription protein region xpbc /ercc promoter acids research tfiih fragment element activity analysis repair msug 1 cap site plasmid factor expression research probe hela tk yeast interaction position xpbc /ercc binding genomic nature assay hsug 1 transcription initiation site xpbc /ercc cdna fraction nucleotide transformant weeda hoeijmaker column oligonucleotide blot analysis initiation hela cells cat activity domain transfection deletion excision extension buffer result primer antibody addition wild-type affinity group cre /tre element 500 mm imidazole bootsma xpbc /ercc transcripts consensus j.h.j subunit complex defect system stretch primer extension science mutation experiment rnase protection rnase fusion immunoprecipitation clone imidazole