7576
Thus, Smad6 and Smad7 exhibit differential inhibitory effects in bone morphogenetic protein-2- and activin A- mediated signaling in B lineage cells .
 ( protein: Smad6, None) , ( cell type: B lineage cells, None) , ( protein: Smad7, 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: Smad6, None) , ( cell type: B lineage cells, None) , ( protein: Smad7, None) 