9824
Although it has two potential binding sites , the purified MerR homodimer binds only one Hg ( II ) ion , employing Cys82 from one monomer and Cys117 and Cys126 from the other .
 GENE: MerR homodimer
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: MerR homodimer 
Answer:
 GENE: MerR homodimer