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Oxidative DNA damage is involved in ochratoxin A - induced G2 arrest through ataxia telangiectasia - mutated ( ATM ) pathways in human gastric epithelium GES - 1 cells in vitro .
 Chemical: ochratoxin A
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ochratoxin A