9597
CONCLUSIONS: MZF-1 and MZF-2 mRNAs seem to be produced by the alternative use of two different transcription initiation sites .
 transcription initiation sites
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:
 transcription initiation sites