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We identified the vRNA sequences involved in five of these interactions at the nucleotide level , and in two cases , we validated the existence of the interaction using compensatory mutations in the interacting sequences .
 Chemical: nucleotide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nucleotide