21230
Binding experiments show that alpha - COP and beta ' - COP have generally the same specificity for KKxx and KxKxx , but only beta ' - COP recognizes the RKxx signal .
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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