18386
The results showed that OciBest (TM) ( 7 . 9 - 2500 . 0 micro g / mL ) did not increase the number of histidine revertant colonies in Salmonella typhimurium strains ( TA98 and TAMix ) with and without exogenous metabolic activation ( S9 ) .
 Chemical: histidine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: histidine