6468
In gut endocrine L cells , the Wnt signaling pathway effector beta - catenin ( beta - cat ) / transcription factor 7 - like 2 mediates the stimulatory effect of insulin on proglucagon ( gcg ) expression and glucagon - like peptide - 1 ( GLP - 1 ) production .
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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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