3278
In each compartment O2 is removed by the tissues as a chemical reaction takes place between O2 and oxyhemoglobin ( HbO2 ) .
 oxyhemoglobin, HbO2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 oxyhemoglobin, HbO2