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Alveolar macrophages are located directly in the surrounding of these cells, so that we suppose an interaction between epithelial cells and macrophages regarding to the release of inflammatory mediators .
 cell type: Alveolar macrophages; protein: inflammatory mediators; cell type: macrophages; cell type: epithelial 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: Alveolar macrophages, inflammatory mediators, macrophages, epithelial cells 
Answer:
 cell type: Alveolar macrophages; protein: inflammatory mediators; cell type: macrophages; cell type: epithelial cells