1134
Structure and expression of the alternative sigma factor , RpoN , in Rhodobacter capsulatus ; physiological relevance of an autoactivated nifU2 - rpoN superoperon .
 GENE: sigma factor; GENE: RpoN; GENE: nifU2; GENE: rpoN
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: sigma factor; GENE: RpoN; GENE: nifU2; GENE: rpoN