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We examined bone marrow cells by reverse transcriptase-polymerase chain reaction ( RT-PCR ) to detect residual PML/RAR alpha mRNA -containing cells following treatment with all-trans retinoic acid ( ATRA ) and cytotoxic chemotherapy in a patient with APL .
 ( cell type: PML/RAR alpha mRNA -containing cells, None) , ( RNA: PML/RAR alpha mRNA, 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: PML/RAR alpha mRNA -containing cells, None) , ( RNA: PML/RAR alpha mRNA, None) 