19922
Moreover , histopathological examination , mitotic index ( MI ) , proliferating cell nuclear antigen labeling , proliferation index ( PI ) , transferase - mediated deoxyuridine triphosphate nick end - labeling assay , apoptotic index ( AI ) were evaluated at day 7 after hepatectomy .
 deoxyuridine triphosphate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 deoxyuridine triphosphate