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A protocol was developed whereby transduction of these mesenchymal cells with adenoviruses containing Pdx1 , Ngn3 , MafA and Pax4 generated a population of cells that were enriched in glucagon - secreting alpha - like cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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