6263
Staurosporine ( PKC inhibitor ), pentoxifylline ( NF-kappa B inhibitor ), and Ro5-3335 ( HIV-1 Tat inhibitor ) also inhibited significantly the heat shock induced virus activation .
 Tat
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:
 Tat