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Furthermore, among the transcription factors tested, AP-1 activity was increased in stimulated purified T helper lymphocytes incubated with ciprofloxacin compared to drug-free controls .
 drug-free controls, transcription factors, stimulated purified T helper lymphocytes, AP-1
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:
 drug-free controls, transcription factors, stimulated purified T helper lymphocytes, AP-1