5020
Introduction of a single mutation to the - 434 GAS element significantly attenuated PRL - stimulated activity of a luciferase reporter driven by the ABCG2 gene promoter and 5 ' - flanking region containing the - 434 GAS motif .
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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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