1982
This suggests that UCU previously belonged to Ser , adding to other indications that the attribution of Arg to YCU was due to an expansion of the Arg - tRNA synthetase specificity .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 None