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However, the ES cell system can be used as an alternative until targeted erythroleukemia cells become available.
 cell line: targeted erythroleukemia 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: targeted erythroleukemia cells 
Answer:
 cell line: targeted erythroleukemia cells