3729
To visualize the specific hepatocytes that had reduced protein sulfhydryl levels , frozen liver sections were labeled with maleimide linked to horseradish peroxidase .
 Chemical: sulfhydryl; Chemical: maleimide
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: sulfhydryl; Chemical: maleimide