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Based on 16S rRNA gene sequence analysis , the 11 species having two tuf genes all have a common ancestor , while the six species having only one copy diverged from the enterococcal lineage before that common ancestor .
 GENE: 16S rRNA gene sequence; GENE: tuf genes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: 16S rRNA gene sequence; GENE: tuf genes