26256
Screening of compounds interacting with GPCRs has developed during the past decade from receptor binding assays , to various functional determination of coupling to G - proteins , and , more recently , G - protein - independent signal transduction events .
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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