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Inhibitory action of nm23 proteins on induction of erythroid differentiation of human leukemia cells .
 cell type: human leukemia cells; protein: nm23 proteins
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: human leukemia cells, nm23 proteins 
Answer:
 cell type: human leukemia cells; protein: nm23 proteins