7797
Rep - Rep protein interaction was confirmed in vitro through coimmunoprecipitation experiments with a bacterially expressed maltose - binding protein - Rep78 fusion protein in combination with [ 35S ] methionine - labeled Rep78 synthesized in a coupled in vitro transcription - translation system .
 Rep, Rep, maltose - binding protein, Rep78, Rep78
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Rep, Rep, maltose - binding protein, Rep78, Rep78