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IRES elements have been proposed to be involved in the translation of picornavirus mRNAs and some cellular mRNAs .
 IRES elements, cellular mRNAs, picornavirus mRNAs, IRES
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:
 IRES elements, cellular mRNAs, picornavirus mRNAs, IRES