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Which of the following NER factors is also a subunit of a transcription factor?

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Which of the following NER factors is also a subunit of a transcription factor?

(a) XPA

(b) XPC

(c) XPF

(d) XPB

I have been asked this question in exam.

The query is from Repair of DNA Damage: NER, Direct Reversal topic in chapter DNA Mutation, DNA Repair, Transposable Elements of Cytogenetics

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The correct answer is (d) XPB

The best I can explain: XPB and XPD are two subunits of the transcriptional factor TFIIH that acts as a helicase unwinding the region around the bulky lesion. It also marks the junctions of the ss and dsDNA where the cleavage would occur.

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