1991
We studied genomic DNA and RNA extracted from the patient's peripheral leucocytes in order to determine the origin of the basophils .
 ( cell type: basophils, None) , ( DNA: genomic DNA, None) , ( RNA: RNA, None) , ( cell type: peripheral leucocytes, 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:
 ( cell type: basophils, None) , ( DNA: genomic DNA, None) , ( RNA: RNA, None) , ( cell type: peripheral leucocytes, None) 