13567
We describe the embryonic expression of musculin , a new murine member of the bHLH family of transcription factors .
 protein: transcription factors; protein: musculin; protein: bHLH family
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: transcription factors, musculin, bHLH family 
Answer:
 protein: transcription factors; protein: musculin; protein: bHLH family