11806
The electrophoretic mobility shift assay with extracts of COS cells expressing GATA-binding proteins showed that GATA-4 has the highest binding affinity to the -70 GATA site among the three GATA-binding proteins .
 ( protein: GATA-binding proteins, None) , ( cell line: COS cells, None) , ( DNA: -70 GATA site, None) , ( protein: GATA-4, None) , ( protein: GATA-binding proteins, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: GATA-binding proteins, None) , ( cell line: COS cells, None) , ( DNA: -70 GATA site, None) , ( protein: GATA-4, None) , ( protein: GATA-binding proteins, None) 