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The coupling of histidine - tagged Xenopus cadherin 11 ( Xcad - 11 ) can also be identified by changes in the fines - structures using XRR .
 Chemical: histidine
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: histidine