9720
The three-dimensional positioning of immunoglobulin (Ig) genes within the nucleus of human cells was investigated using in situ hybridization and confocal microscopy .
 ( cell type: human cells, None) , ( DNA: immunoglobulin (Ig) genes, 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: human cells, None) , ( DNA: immunoglobulin (Ig) genes, None) 