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To induce diabetes mellitus , rats were injected with streptozotocin intraperitoneally at a single dose of 40 mg / kg b . w .
 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