7107
In order to determine which sequences in the GATA - 1 promoter are crucial for activation by the ME26 viral protein , we made deletions of the promoter , cloned them into a luciferase expression vector and tested their activity in mouse fibroblasts , which do not express GATA - 1 .
 GATA - 1 promoter, ME26 viral protein, luciferase, GATA - 1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 GATA - 1 promoter, ME26 viral protein, luciferase, GATA - 1