7571
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 .
 hBMP-2, hBMP-2, mouse B cell hybridoma, Smad6, Smad7, human bone morphogenetic protein-2, HS-72 cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 hBMP-2, hBMP-2, mouse B cell hybridoma, Smad6, Smad7, human bone morphogenetic protein-2, HS-72 cells