21044
To investigate possible effects , we exposed the common mussel Mytilus galloprovincialis in seawater supplemented by 30 mu g / L Hg ( 2 + ) for 15 days .
 Chemical: Hg ( 2 + )
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: Hg ( 2 + )