2171
In seven diabetic patients with proliferative retinopathy , the most profound finding was a significant decrease of the PEDF level ( mean value : 237 ng / ml ) , whereas VEGF levels were comparable to diabetic patients without proliferation ( mean value : 3153 ; p = 0 . 003 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
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