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To investigate the transcriptional regulation of these genes we cotransfected constructs expressing CAT under control of the MRP14 promoter and expression constructs of C/EBP alpha and v-myb , two transcription factors involved in myeloid/monocytic differentiation .
 ( protein: MRP14, None) , ( protein: transcription factors, None) , ( protein: v-myb, None) , ( DNA: MRP14 promoter, None) , ( protein: C/EBP alpha, None) , ( protein: CAT, 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: MRP14, None) , ( protein: transcription factors, None) , ( protein: v-myb, None) , ( DNA: MRP14 promoter, None) , ( protein: C/EBP alpha, None) , ( protein: CAT, None) 