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In co-transfection experiments , the galectin-3 promoter was significantly up-regulated by expression vectors encoding the 40-kd Tax protein , a potent transactivator in HTLV-I .
 galectin-3, expression vectors, galectin-3 promoter, 40-kd Tax protein
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:
 galectin-3, expression vectors, galectin-3 promoter, 40-kd Tax protein