4512
The average backscatter coefficient was six time larger in regions of infarct studied 8 - - 10 weeks after occlusion than that in regions of infarct studied 5 - - 6 weeks after occlusion .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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