12946
Thus , RIF1 and 53BP1 cooperate to block DSB resection to promote NHEJ in G1 , which is antagonized by BRCA1 in S phase to ensure a switch of DSB repair mode to homologous recombination .
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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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