18376
When assessed by mitotic index , micronucleus , and chromosomal aberration assays , NB showed dose - dependent genotoxicity at 0 mg L ( - 1 ) to 50 mg L ( - 1 ) .
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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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