9546
A reactive photo - leucine can clamp the front residues in beta - turn and beta - hairpin domains , thus allowing us to look into the specific native 3D structure of proteins .
 Chemical: leucine
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: leucine