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Employing the EBV-transformed human B cell line SKW6.4 , we demonstrate that platelet-activating factor significantly alters membrane phospholipid metabolism indicated by the incorporation of 32P into phosphatidylcholine , phosphatidylinositol , and phosphatidic acid but not significantly into phosphatidylethanolamine at concentrations ranging from 10(-9) to 10(-6) M.
 cell line: SKW6.4; cell line: human B cell line; cell line: EBV-transformed human 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: SKW6.4; cell line: human B cell line; cell line: EBV-transformed human B cell line; protein: platelet-activating factor