12864
Since neither DNA binding nor protein dimerization through the bZIP domain of HLF is required for this effect, we propose mechanisms whereby protein-protein interactions with the amino-terminal region of E2A allow the chimera to act as a transcriptional cofactor to alter the expression of genes regulating the apoptotic machinery in pro-B cells .
 protein: chimera; protein: bZIP domain; protein: HLF; protein: E2A; cell type: pro-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: chimera, bZIP domain, HLF, E2A, pro-B cells 
Answer:
 protein: chimera; protein: bZIP domain; protein: HLF; protein: E2A; cell type: pro-B cells