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The aim of this present study was to investigate the role of protein kinase C ( PKC ), downstream of p21ras , in activating interleukin-2 (IL-2) gene expression .
 protein kinase C, interleukin-2 (IL-2) gene, p21ras, PKC
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:
 protein kinase C, interleukin-2 (IL-2) gene, p21ras, PKC