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Although many functions of human alveolar macrophages are altered compared with their precursor cell , the blood monocyte ( monocyte ), the reason(s) for these functional changes have not been determined.
 cell type: blood monocyte; cell type: human alveolar macrophages; cell type: precursor cell; cell type: monocyte
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 monocyte, human alveolar macrophages, precursor cell, monocyte 
Answer:
 cell type: blood monocyte; cell type: human alveolar macrophages; cell type: precursor cell; cell type: monocyte