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To identify osteoblast-specific cis-acting elements and trans-acting factors , we initiated an analysis of the promoter of a mouse osteocalcin gene , an osteoblast-specific gene .
 DNA: mouse osteocalcin gene; DNA: promoter; DNA: osteoblast-specific cis-acting elements; protein: trans-acting factors; DNA: osteoblast-specific gene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: mouse osteocalcin gene; DNA: promoter; DNA: osteoblast-specific cis-acting elements; protein: trans-acting factors; DNA: osteoblast-specific gene