8476
The method was demonstrated using hypoxia inducible factor hydroxylases and histone demethylases , and K ( D ) values were determined for inhibitors that compete with 2OG at the metal center .
 2OG
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 2OG