7592
Acetoin - dependent expression of the acoABCD operon could be restored in the E . coli acoK mutants by supplying a plasmid carrying an intact acoK , suggesting a transactivating function of the gene product .
 acoABCD operon, E . coli acoK mutants, acoK
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 acoABCD operon, E . coli acoK mutants, acoK