8727
We found that: (i) both CTCF mRNA and protein are down-regulated during terminal differentiation in most cell lines tested; (ii) CTCF down-regulation is retarded and less pronounced than that of c-myc ; (iii) CTCF protein is differentially phosphorylated and the phosphorylation profiles depend on the differentiation pathway .
 ( protein: CTCF protein, None) , ( DNA: c-myc, None) , ( protein: CTCF, None) , ( protein: CTCF, None) , ( protein: CTCF, None) , ( RNA: CTCF 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:
 ( protein: CTCF protein, None) , ( DNA: c-myc, None) , ( protein: CTCF, None) , ( protein: CTCF, None) , ( protein: CTCF, None) , ( RNA: CTCF mRNA, None) 