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However , oxidative and anti - oxidative capacity markers , such as iron / copper status , alpha - tocopherol concentrations and TEAC values , could not explain these differences .
 iron, copper, alpha - tocopherol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 iron, copper, alpha - tocopherol