8212
Overexpression and down - regulation of EHI _ 108720 demonstrated the specificity of EHI _ 108720 protein binding to the HRM , and overexpression increased basal expression from an H ( 2 ) O ( 2 ) - responsive wild - type promoter but not from its mutant counterpart .
 Chemical: H ( 2 ) O ( 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: H ( 2 ) O ( 2 )