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As in IncP alpha plasmids , these operons are transcribed from a bidirectional promoter region consisting of trfAp for the trfA operon and trbAp and trbBp for the trb operon .
 GENE: trfAp; GENE: trfA operon; GENE: trbAp; GENE: trbBp; GENE: trb operon
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: trfAp; GENE: trfA operon; GENE: trbAp; GENE: trbBp; GENE: trb operon