818
A previously unrecognized element, located downstream of the start site of transcription in the first exon of the DR alpha gene , has been defined that enhances promoter activity up to eightfold in a position-dependent manner .
 DR alpha gene, exon, start site of transcription
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:
 DR alpha gene, exon, start site of transcription