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Models of both type 1 ( C57BL / 6 mice with streptozotocin - induced diabetes ) and type 2 diabetes ( db / db mice ) and age - matched and sex - matched controls were examined .
 Chemical: streptozotocin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: streptozotocin