1784
To identify ets-related transcriptional regulators expressed in pre-B lymphocytes that may interact with either the pi or the microB site , we have used a PCR approach with degenerate oligonucleotides encoding conserved sequences in all members of the ets family .
 ( cell type: pre-B lymphocytes, None) , ( protein: ets-related transcriptional regulators, None) , ( DNA: microB site, None) , ( DNA: ets family, None) , ( DNA: microB, None) , ( DNA: pi, 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: pre-B lymphocytes, None) , ( protein: ets-related transcriptional regulators, None) , ( DNA: microB site, None) , ( DNA: ets family, None) , ( DNA: microB, None) , ( DNA: pi, None) 