2459
The transcriptional transactivator ( Tas ) of simian foamy virus type 1 strongly augments gene expression directed by both the promoter in the viral long terminal repeat and the newly discovered internal promoter located within the env gene .
 GENE: transcriptional transactivator; GENE: Tas; GENE: env 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: transcriptional transactivator; GENE: Tas; GENE: env gene