7116
Carbon catabolite repression of the gnt operon of Bacillus subtilis is mediated by the catabolite control protein CcpA and by HPr , a phosphocarrier protein of the phosphotransferase system .
 gnt operon of Bacillus subtilis, CcpA, HPr
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 gnt operon of Bacillus subtilis, CcpA, HPr