13664
In contrast, induction of differentiation but not of proliferation was followed by a 25- to 30-fold increase in the nuclear level of the tumor suppressor proteins p53 (wild type), pRb , and p130/Rb2 and of the p53-dependent cyclin kinase inhibitor p21/Cip1 .
 ( protein: p21/Cip1, None) , ( protein: p130/Rb2, None) , ( protein: p53-dependent cyclin kinase inhibitor, None) , ( protein: pRb, None) , ( protein: tumor suppressor proteins p53, 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: p21/Cip1, None) , ( protein: p130/Rb2, None) , ( protein: p53-dependent cyclin kinase inhibitor, None) , ( protein: pRb, None) , ( protein: tumor suppressor proteins p53, None) 