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The roles of modified and unmodified EF - P during different steps in translation , and how this correlates to its physiological role in the cell , have recently been linked to the synthesis of polyproline stretches in proteins .
 Chemical: polyproline
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyproline