25665
The E1 - b ' mRNA possesses unusual functional features in its 5 ' - untranslated region , including a GC - rich leader sequence and two upstream AUGs that encode for short peptides of 26 and 17 amino acids in length , respectively .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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