8430
The gene most frequently mutated in CS , Cockayne Syndrome B ( CSB ) , is required for the repair of bulky DNA adducts in transcribed genes during transcription - coupled nucleotide excision repair .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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