5406
In this study , we demonstrate that BOX DNA enhances transcription from the thymidine kinase ( TK ) promoter in various EC cells .
 thymidine kinase, TK
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 thymidine kinase, TK