8279
Consistent with previous data from human and mouse fibroblasts and T-lymphocytes , E2F4 and DP1 form the predominant E2F heterodimers both in G0 and G1 phases of the human B-lymphocyte cell cycle , whereas E2F 1 and -3 are first detected in late G1 , and their expression levels increase towards S phase .
 ( protein: E2F heterodimers, None) , ( protein: DP1, None) , ( protein: E2F4, None) , ( cell type: T-lymphocytes, 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: E2F heterodimers, None) , ( protein: DP1, None) , ( protein: E2F4, None) , ( cell type: T-lymphocytes, None) 