2434
Most cells infected with hRAR alpha exhibited promyelocytic morphology and were thought to be blocked at the promyelocytic stage in their myeloid differentiation .
 ( protein: hRAR alpha, None) , ( cell type: promyelocytic morphology, 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: hRAR alpha, None) , ( cell type: promyelocytic morphology, None) 