1014
The receptor was tested immunocytochemically, in steroid binding assays , and by a mutation screening ( denaturing gradient gel electrophoresis ) of the receptor-cDNA .
 ( protein: receptor-cDNA, 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: receptor-cDNA, None) 