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The expression of c-fos , c-jun and jun B proto-oncogenes was studied in phytohemagglutinin ( PHA ) activated peripheral blood lymphocytes ( PBL ) from young and aged humans .
 protein: PHA; cell line: phytohemagglutinin ( PHA ) activated peripheral blood lymphocytes; cell type: PBL; protein: phytohemagglutinin
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: PHA; cell line: phytohemagglutinin ( PHA ) activated peripheral blood lymphocytes; cell type: PBL; protein: phytohemagglutinin