24238
Our results show that multiple 2 ' - deoxynucleotide substitutions in the mRNA substantially inhibit tRNA selection , whereas multiple 2 ' - fluoro substitutions in the mRNA have only modest effects on tRNA selection .
 2 ' - fluoro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 2 ' - fluoro