13201
Additionally , these effects of ATO on gamma - H2AX , Chk1 , Chk2 , p53 , and p21 ( waf1 / cip1 ) were reduced by an ATM inhibitor .
 Chemical: ATO
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ATO 
Answer:
 Chemical: ATO