28421
The resulting seleno - ferritin ( Se - Fn ) monomers can self - assemble into nanocomposites that exhibit remarkable GPx activity due to the well organized multi - GPx catalytic centers .
 Chemical: Se
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: Se