2879
The ultrastructural findings , as well as the urinary C - peptide excretion , confirmed that the glycemic effects should not be thought to be due to a direct action of the drugs used on the endocrine pancreas .
 C - peptide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 C - peptide