18693
Genotoxic effects of the water - soluble fraction of heavy oil in the brackish / freshwater amphipod Quadrivisio aff . lutzi ( Gammaridea ) as assessed using the comet assay .
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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:
 None