3180
In this study , we determined the effect of Rhodobacter sphaeroides lipopolysaccharide ( Rs - LPS ) , an established TLR4 antagonist , on early - stage atherosclerosis in nondiabetic and streptozotocin - induced diabetic apolipoprotein E - deficient ( Apoe ( - / - ) ) mice .
 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