7214
In this study , we used Mig6 heterozygous knockout mice ( Mig6 ( + / - ) ) to study the role of Mig6 in regulating beta - cell proliferation and survival .
 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