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Promoter deletion constructs demonstrated the potential role of distal promoter sequences in regulating collagenase-1 transcription .
 collagenase-1, distal promoter sequences
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:
 collagenase-1, distal promoter sequences