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These studies suggest that the hXBP-1 protein acts as a transcription factor in B cells .
 protein: transcription factor; protein: hXBP-1 protein; cell type: B cells; protein: hXBP-1
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: hXBP-1 protein; cell type: B cells; protein: hXBP-1