878
The amino acid sequences of the predicted RfbA and RfbB homologs showed identities of 75 . 7 % ( 87 . 9 % total similarity ) and 78 . 0 % ( 86 . 5 % total similarity ) , respectively .
 GENE: RfbA; GENE: RfbB homologs
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: RfbA; GENE: RfbB homologs