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These cells exhibit many alterations in function compared with their precursor cells , blood monocytes .
 cell type: blood monocytes; cell type: precursor 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: blood monocytes, precursor cells 
Answer:
 cell type: blood monocytes; cell type: precursor cells