510
Interleukin-2 ( IL-2 ) gene expression is controlled transcriptionally by the cooperative activity of specific trans-activating factors that bind to the IL-2 enhancer .
 protein: IL-2; protein: IL-2; DNA: Interleukin-2 ( IL-2 ) gene; DNA: IL-2 enhancer; protein: trans-activating factors; protein: Interleukin-2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: IL-2; protein: IL-2; DNA: Interleukin-2 ( IL-2 ) gene; DNA: IL-2 enhancer; protein: trans-activating factors; protein: Interleukin-2