7677
Recombinant plasmids containing the entire 322 nt 5 ' UTR of exon 1 and a 1630 nt segment of 5 ' flanking sequence stimulated luciferase activity nearly 70 times higher than a promoterless control plasmid .
 luciferase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 luciferase