1442
T cell expression of interleukin 3 ( IL-3 ) is directed by positive and negative cis-acting DNA elements clustered within 300 base pairs of the transcriptional start site .
 protein: interleukin 3; DNA: transcriptional start site; protein: IL-3
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: interleukin 3; DNA: transcriptional start site; protein: IL-3