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Recent analysis of gene-targeted mice has allowed a direct assessment of the functional roles of several E-protein family members in hematopoiesis.
 protein: several E-protein family members
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: several E-protein family members 
Answer:
 protein: several E-protein family members