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Here we demonstrate that both Smad6 and Smad7 are human bone morphogenetic protein-2 ( hBMP-2 )-inducible antagonists of hBMP-2 -induced growth arrest and apoptosis in mouse B cell hybridoma HS-72 cells .
 ( protein: hBMP-2, None) , ( protein: hBMP-2, None) , ( cell line: mouse B cell hybridoma, None) , ( protein: Smad6, None) , ( protein: Smad7, None) , ( protein: human bone morphogenetic protein-2, None) , ( cell line: HS-72 cells, 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: hBMP-2, None) , ( protein: hBMP-2, None) , ( cell line: mouse B cell hybridoma, None) , ( protein: Smad6, None) , ( protein: Smad7, None) , ( protein: human bone morphogenetic protein-2, None) , ( cell line: HS-72 cells, None) 