1764
Cells were co - infected simultaneously with IBV , the recombinant FPV ( rFPV ) containing the D - RNA sequence and a second rFPV expressing T7 RNA polymerase for the initial expression of the D - RNA transcript , subsequently rescued by helper IBV .
 GENE: T7 RNA polymerase
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: T7 RNA polymerase