3849
The CRE site in the bcl-2 promoter appears to play a major role in the induction of bcl-2 expression during the activation of mature B cells and during the rescue of immature B cells from apoptosis.
 cell type: immature B cells; DNA: CRE site; DNA: bcl-2 promoter; cell type: mature B cells; cell type: B cells; protein: bcl-2; cell type: B cells
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: immature B cells, CRE site, bcl-2 promoter, mature B cells, B cells, bcl-2, B cells 
Answer:
 cell type: immature B cells; DNA: CRE site; DNA: bcl-2 promoter; cell type: mature B cells; cell type: B cells; protein: bcl-2; cell type: B cells