3463
This suggests that for the mutant receptors , ECII plays a critical role in linking the agonist bound receptor conformation to the G protein nucleotide bound state .
 Chemical: nucleotide
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: nucleotide