13933
Metallothionein induction may also play a role in the observed acclimation , as Cu - acclimated fish had a significantly higher metallothionein concentration compared to the control fish .
 Chemical: Cu
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Cu 
Answer:
 Chemical: Cu