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Internal ribosome binding likely requires the interaction of trans-acting factors that recognize both the mRNA and the ribosomal complex .
 trans-acting factors, ribosomal complex, mRNA
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:
 trans-acting factors, ribosomal complex, mRNA