546
The relative cytotoxicity of these samples was established by determining their NI50 values ( 50 % inhibition of NRU ) , and these results were used for dose - finding in genotoxicity tests .
 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