64639
Poliovirus mRNA uses a cloverleaf section towards its 5 ' end to bind PCBP2 , which binds poly ( A ) - binding protein , forming the familiar mRNA-protein-mRNA circle .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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