746
BSAP has been identified previously as a transcription factor that is expressed at early, but not late, stages of B-cell differentiation .
 protein: transcription factor; protein: BSAP
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: transcription factor; protein: BSAP