17778
We examined the roles of carboxypeptidase E ( CPE ) , a prohormone sorting receptor , the processing enzymes PC1 / 3 and PC2 and putative intrinsic sorting signals in proglucagon sorting .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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