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To delineate the pathogenesis , we examined changes in the mRNA levels of 2 angiotensin II Type I receptor ( AT1R ) subtypes , AT1AR and AT1BR , in a mouse aortic endothelial cell line , END - D .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None