21358
Unraveling the Role of the Protein Environment for [ FeFe ] - Hydrogenase : A New Application of Coarse - Graining .
 Chemical: [ FeFe ]
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: [ FeFe ]