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To explore the putative roles of oxidative DNA damage and the ataxia telangiectasia - mutated ( ATM ) pathways on the OTA - induced G2 arrest , the current study systematically evaluated the roles of reactive oxygen species ( ROS ) production , DNA damage , and ATM - dependent pathway activation on the OTA - induced G2 phase arrest in GES - 1 cells .
 Chemical: OTA; Chemical: oxygen; Chemical: OTA
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: OTA; Chemical: oxygen; Chemical: OTA