12170
A specific inhibitor of caspases , zVAD-FMK , prevents triptolide -induced PARP degradation and DNA fragmentation but not growth arrest.
 PARP, caspases
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 PARP, caspases