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Studies of the actions of platelet-activating factor have centered mainly around neutrophils , monocytes , and platelets .
 protein: platelet-activating factor; cell type: platelets; cell type: neutrophils; cell type: monocytes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: platelet-activating factor; cell type: platelets; cell type: neutrophils; cell type: monocytes