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Mammalian frataxin controls sulfur production and iron entry during de novo Fe4S4 cluster assembly .
 Chemical: sulfur; Chemical: iron; Chemical: Fe4S4
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sulfur; Chemical: iron; Chemical: Fe4S4