13199
Moreover , phosphorylation / activation of the checkpoint kinases Chk1 , Chk2 and p53 levels were increased , as were levels of activated ATM and gamma - H2AX .
 None
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