20665
In this study , exendin - 4 , a glucagon - like peptide - 1 analog improved islet transplantation outcome by increasing the survival of diabetic recipient mice from 58 % to 100 % .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None