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The tract - induced point mutations appear to reflect a different mechanism involving single - strand annealing of DNA molecules generated by DSBs within the tract , followed by filling - in of single - stranded gaps by the error - prone DNA polymerase zeta .
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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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