3549
Mutations in nifR1 ( ntrC ) and nifR4 ( rpoN , encoding sigma54 ) had no influence on xdh gene expression .
 GENE: nifR1; GENE: ntrC; GENE: nifR4; GENE: rpoN; GENE: sigma54; GENE: xdh gene
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: nifR1; GENE: ntrC; GENE: nifR4; GENE: rpoN; GENE: sigma54; GENE: xdh gene