1991
Repair of double - strand breaks ( DSBs ) in chromosomal DNA by nonhomologous end - joining ( NHEJ ) is not well characterized in the yeast Saccharomyces cerevisiae .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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