5019
Corroborating these findings , we observed PRL - stimulated STAT5 recruitment to a region containing a putative gamma - interferon activation sequence ( GAS ) element at - 434 base pairs upstream of the ABCG2 transcription start site .
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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:
 None