10240
These aptamer - substrate complexes or T - Hg ( 2 + ) - T bridges allosterically stabilize and activate the DNAzymes , thus allowing the selective release of the fluorescent substrates MB ( + ) or Th ( + ) .
 Chemical: Hg ( 2 + )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Hg ( 2 + )