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In summary, platelet-activating factor is shown here to have a direct and profound effect on a pure B cell line .
 cell line: pure B cell line; protein: platelet-activating factor
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:
 cell line: pure B cell line; protein: platelet-activating factor