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The goal of the present experiments was to determine whether ovarian , or other sources of estrogens , contributes to the resistance to excess weight gain in female rats fed standard chow diets along with dietary supplements sweetened with yogurt .
 estrogens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 estrogens