76847
They used a cell-free system to translate a poly-uracil RNA sequence ( or UUUUU ... in biochemical terms ) and discovered that the polypeptide they had synthesized consisted of only the amino acid phenylalanine .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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