1425
In contrast to parental U937 cells , PKC-zeta cells constitutively expressed mRNA transcripts for c-jun and a low mobility AP-1 binding activity .
 ( cell line: PKC-zeta cells, None) , ( RNA: mRNA, None) , ( RNA: mRNA transcripts, None) , ( DNA: c-jun, None) , ( protein: AP-1, None) , ( cell line: U937 cells, None) , ( protein: PKC-zeta, 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 line: PKC-zeta cells, None) , ( RNA: mRNA, None) , ( RNA: mRNA transcripts, None) , ( DNA: c-jun, None) , ( protein: AP-1, None) , ( cell line: U937 cells, None) , ( protein: PKC-zeta, None) 