1874
IST is not the RNA target ( TAR ) for Tat trans - activation ; however , because it relies entirely on cellular factors for activity , IST may serve to provide abundant RNA targets for Tat trans - activation without a requirement for full - length viral mRNA expression .
 GENE: IST; GENE: Tat; GENE: IST; GENE: Tat
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: IST, Tat, IST, Tat 
Answer:
 GENE: IST; GENE: Tat; GENE: IST; GENE: Tat