6890
We show that Rnf4 - deficiency causes persistent ionizing radiation - induced DNA damage and signaling , and that Rnf4 - deficient cells and mice exhibit increased sensitivity to genotoxic stress .
 None
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:  
Answer:
 None