1043
It is very likely that these domains bind megakaryocyte-specific nuclear proteins acting as positive transcription factors .
 protein: positive transcription factors; protein: transcription factors; protein: megakaryocyte-specific nuclear proteins
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:
 protein: positive transcription factors; protein: transcription factors; protein: megakaryocyte-specific nuclear proteins