6260
We found that this latently infected cell line with heat shock at 42 degrees C for 2 h resulted in a high level of HIV-1 production without addition of any cytokines .
 cytokines
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:
 cytokines