17648
Among them , several proteins related to mitochondrial function ( e . g . respiratory metabolism ) were significantly altered in the treated hepatocytes , implying that this organelle might be the primary target for Hg attack in the cells .
 Chemical: Hg
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Hg 
Answer:
 Chemical: Hg