6669
METHODS: Methods used in this study include DNase I footprint assays , electrophoretic mobility shift assays , and functional analysis by mammalian cell transfection involving deletion analysis and site-directed mutagenesis .
 DNase I
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:
 DNase I