2961
In addition , disulfide trapping indicated the close proximity of Glu167 and Arg290 when the channel is in the closed state , but not in the ATP - bound open state .
 Chemical: disulfide; Chemical: Glu167; Chemical: Arg290; Chemical: ATP
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: disulfide, Glu167, Arg290, ATP 
Answer:
 Chemical: disulfide; Chemical: Glu167; Chemical: Arg290; Chemical: ATP