4942
Our findings offer new ways toward the understanding of O ( 2 ) inactivation and O ( 2 ) tolerance in NiFe hydrogenases .
 Chemical: O ( 2 ); Chemical: O ( 2 ); Chemical: NiFe
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: O ( 2 ); Chemical: O ( 2 ); Chemical: NiFe