690
Acute megakaryoblastic leukaemia ( M7 ) and transient myeloproliferative disorder in Down's syndrome ( TMD ) are characterized by rapid growth of abnormal blast cells which express megakaryocytic markers .
 ( cell type: abnormal blast cells, None) , ( protein: megakaryocytic markers, 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:
 ( cell type: abnormal blast cells, None) , ( protein: megakaryocytic markers, None) 