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Human prostatic epithelial cells from an androgen-dependent LNCaP cell line were examined in response to conditioned medium ( CM ) derived from phytohemagglutinin ( PHA )-stimulated lymphocytes .
 ( cell line: Human prostatic epithelial cells, None) , ( protein: phytohemagglutinin, None) , ( cell line: androgen-dependent LNCaP cell line, None) , ( protein: PHA, None) , ( cell line: phytohemagglutinin ( PHA )-stimulated lymphocytes, None) , ( cell type: lymphocytes, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: Human prostatic epithelial cells, None) , ( protein: phytohemagglutinin, None) , ( cell line: androgen-dependent LNCaP cell line, None) , ( protein: PHA, None) , ( cell line: phytohemagglutinin ( PHA )-stimulated lymphocytes, None) , ( cell type: lymphocytes, None) 