38984
In bacteria , carbon monoxide is produced via the reduction of carbon dioxide by the enzyme carbon monoxide dehydrogenase , an Fe-Ni-S-containing protein .
 Fe-Ni-S-containing
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fe-Ni-S-containing