2098
Forty 4 - month old SD female rats were randomly divided into four groups , namely sham operation , bilateral ovariectomy , ovariectomy plus supplementary ethinyl estradiol ( 0 . 2 microgram / 100 g B .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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