473
The gene contains a proximal functional promoter region ( -620 to +34 ), as well as a powerful enhancer located 3 kb upstream, both of which are involved in the response of the gene to TCR activation .
 proximal functional promoter region, enhancer, -620 to +34, TCR
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:
 proximal functional promoter region, enhancer, -620 to +34, TCR