7219
The reconstituted RNA polymerases containing the mutant alpha subunits were examined for their response to transcription activation by cAMP - CRP and the rrnBP1 UP element .
 RNA polymerases, cAMP - CRP, rrnBP1 UP element
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 RNA polymerases, cAMP - CRP, rrnBP1 UP element