3119
The 20 - HETE agonist markedly increased superoxide formation as reflected by an increase in dihydroethidium staining of EC , and this increase was inhibited by PEG - SOD but not by apocynin .
 EC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 EC