3775
Proper expression and trafficking of receptor were confirmed by the " rim - like " fluorescence of fluorescently tagged receptor and the positive staining of external hemagglutinin - tagged GPR18 - expressing cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None