7771
Thus , the P . aeruginosa orfX and vfr promoters are arranged in a back - to - back orientation rather than the face - to - face orientation of the dorf and crp promoters .
 GENE: vfr promoters; GENE: crp promoters
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: vfr promoters, crp promoters 
Answer:
 GENE: vfr promoters; GENE: crp promoters