7947
In this study , uptake of phenformin and [ ( 14 ) C ] tetraethylammonium ( TEA ) and complex I inhibition by phenformin were examined in isolated liver and heart mitochondria .
 phenformin, [ ( 14 ) C ] tetraethylammonium, TEA, phenformin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 phenformin, [ ( 14 ) C ] tetraethylammonium, TEA, phenformin