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The contribution to T cell-specific expression by other promoter sites was assessed in a transient expression assay with IL-3 promoter constructs linked to a luciferase gene , focusing initially on the core binding factor (CBF) site , which is footprinted in vivo upon T cell activation .
 IL-3, core binding factor, IL-3 promoter constructs, core binding factor (CBF) site, luciferase gene, promoter sites
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:
 IL-3, core binding factor, IL-3 promoter constructs, core binding factor (CBF) site, luciferase gene, promoter sites