21045
We observed that Hg ( 2 + ) was significantly accumulated in the digestive glands of mussels , reaching a level around 80 mu g / g tissue ( dry weight ) at the 15th day of exposure .
 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 + )