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For IL-2R and signaling pathway molecule analysis , peripheral blood lymphocytes were stimulated with phytohemagglutinin ( PHA ).
 phytohemagglutinin, IL-2R, blood lymphocytes, PHA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 phytohemagglutinin, IL-2R, blood lymphocytes, PHA