8998
Collectively , by using a pancreas - specific TGF beta receptor - deleted mouse model , we have identified two distinct pathways that regulate adult beta - cell proliferation .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None