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The Rop protein , which promotes plasmid replication in bacteria , is an interesting case in which a single polypeptide forms a coiled-coil and two monomers assemble to form a four-helix bundle .
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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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