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An in vitro surrogate of IL-2 immunotherapy is the incubation of fresh peripheral blood mononuclear cells ( PBMC ) from healthy individuals in IL-2 for several days, resulting in the production of lymphokine -activated killer (LAK) activity in these cultures.
 IL-2, PBMC, IL-2, fresh peripheral blood mononuclear cells, lymphokine
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:
 IL-2, PBMC, IL-2, fresh peripheral blood mononuclear cells, lymphokine