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These results suggest that the activation signals in human B cells and monocytes differ following CD40 stimulation .
 protein: CD40; cell type: human B cells; cell type: monocytes
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: CD40, human B cells, monocytes 
Answer:
 protein: CD40; cell type: human B cells; cell type: monocytes