2489
The " Met - turn " structure contains a conserved Met residue that forms a hydrophobic basement for the three zinc - binding histidines in the consensus sequence .
 Chemical: Met; Chemical: Met; Chemical: zinc; Chemical: histidines
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: Met; Chemical: Met; Chemical: zinc; Chemical: histidines