3299
To further investigate the role of PKR in transcriptional signaling , we expressed the wild type human PKR and a catalytically inactive dominant negative PKR mutant in the murine pre - B lymphoma 70Z / 3 cells .
 GENE: PKR; GENE: wild type human PKR; GENE: PKR mutant
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: PKR; GENE: wild type human PKR; GENE: PKR mutant