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Transient transfection of HeLa cells with deleted gene promoter constructs allowed us to identify a Serum Response Element ( SRE ) to which Serum Response Factor ( SRF ) binds and thus transactivates PFKFB3 gene transcription .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None