7021
Combined treatment of HPCs with alpha-PML and alpha-Rb oligomers inhibited both PML and Rb protein expression and completely blocked erythroid colony development .
 ( protein: alpha-PML, None) , ( cell type: HPCs, 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: alpha-PML, None) , ( cell type: HPCs, None) 