17781
siRNA - mediated knockdown of CPE disrupted regulated secretion of glucagon from pancreatic - derived alphaTC1 - 6 cells , but not of GLP - 1 from intestinal cell - derived GLUTag cells .
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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:
 None