7569
Differential inhibition of Smad6 and Smad7 on bone morphogenetic protein- and activin- mediated growth arrest and apoptosis in B cells .
 ( cell type: B cells, None) , ( protein: Smad7, None) , ( protein: Smad6, 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: B cells, None) , ( protein: Smad7, None) , ( protein: Smad6, None) 