747
These temperature - and cold - sensitive strains were used to prepare extracts deficient in BRF1 activity and were tested for transcriptional activity by RNA polymerases I , II , and III in vitro .
 BRF1, RNA polymerases I , II , and III
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 BRF1, RNA polymerases I , II , and III