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In addition , it was found that OTA treatment induced the phosphorylation of the ATM protein , as well as its downstream molecules Chk2 and p53 , in response to DNA DSBs .
 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