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In order to elucidate the mode of action of some of these compounds , molecular modeling was employed to dock a suite of molecules into the ATP - binding domain of several histidine kinases .
 Chemical: ATP; 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: ATP; Chemical: histidine