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A factor in bovine colostrum ( colostrum inhibitory factor , CIF ) inhibits interleukin 2 ( IL2 ) production in activated T helper cells by blocking the accumulation of IL2 mRNA .
 IL2, colostrum inhibitory factor, IL2 mRNA, T helper cells, IL2, interleukin 2, CIF
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:
 IL2, colostrum inhibitory factor, IL2 mRNA, T helper cells, IL2, interleukin 2, CIF