13821
It has been reported that beta - cell progenitors can be activated by ductal ligation - induced injury of adult mouse pancreas and apparently act in a cell - autonomous manner to double the functional beta - cell mass within a week by differentiation and proliferation .
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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:
 None