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P2X receptors are trimeric adenosine - 5 ' - triphosphate ( ATP ) - gated cation channels involved in fast signal transduction in many cell types .
 Chemical: adenosine - 5 ' - triphosphate; 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: adenosine - 5 ' - triphosphate, ATP 
Answer:
 Chemical: adenosine - 5 ' - triphosphate; Chemical: ATP