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We performed a comprehensive microarray analysis of ER alpha - positive and ER alpha - negative MDA - MB - 231 cells upon leptin treatment and identified 49 genes which showed a significant ER alpha - dependent regulation in leptin - treated MDA - MB - 231 cells .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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