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The knowledge of DNA repair in a target species is of first importance as it is the primary line of defense against genotoxicants , and a better knowledge of DNA repair capacity in fish could help to interpret genotoxicity data and / or assist in the choice of target species , developmental stage and tissues to focus on , both for environmental biomonitoring studies and DNA repair testing .
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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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