1231
A region approximately 100 bp upstream from the transcription start point of virB was identified as being necessary for full activation of this promoter by VirF .
 GENE: virB; GENE: VirF
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: virB; GENE: VirF