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Previous structural studies indicated that the ribosome distinguishes between cognate and near - cognate tRNAs by monitoring the geometry of the codon - anticodon helix in the decoding center using the universally conserved 16S ribosomal RNA bases G530 , A1492 and A1493 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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