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The C - terminal domain was demonstrated to coordinate an iron - sulfur cluster , providing the first example of a viral structural protein binding to this type of metal group .
 Chemical: C; Chemical: iron - sulfur
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: C; Chemical: iron - sulfur