13664
The preparation was tested for reverse mutation at doses up to 5 , 000 mu g / plate in Salmonella typhimurium strains TA98 , TA100 , TA1535 , and TA1537 , and in Escherichia coli WP2 uvrA TA , both in the presence and in the absence of an exogenous source of metabolic activation ( rat liver S9 ) .
 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