21254
In vitro and in vivo , LIN28 preferentially bound single - stranded RNA containing a uridine - rich element and one or more flanking guanosines and appeared to be able to disrupt base - pairing to access these elements when embedded in predicted secondary structure .
 Chemical: uridine; Chemical: guanosines
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: uridine; Chemical: guanosines