6250
These contained the luciferase gene under the control of either the human IL2 upstream enhancer region (segments -326 to +45) or three repeats of the NFAT element contained within it (segments -255 to -285).
 luciferase, NFAT element, luciferase gene, IL2, human IL2 upstream enhancer
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:
 luciferase, NFAT element, luciferase gene, IL2, human IL2 upstream enhancer