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In the current study , we demonstrated that treatment of two ovarian cancer cell lines , SKOV3 and OVCAR5 , with EGF induced the expression of the transcription factor Egr - 1 , and this induction was abolished by small interfering RNA ( siRNA ) - mediated depletion of the EGF receptor .
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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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