1573
The predicted protein sequence of B1 is 81% identical to human matrix metalloproteinase 9 ( MMP9 ), demonstrating that it is the bovine homologue of this enzyme.
 ( protein: MMP9, None) , ( protein: B1, None) , ( protein: matrix metalloproteinase 9, 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: MMP9, None) , ( protein: B1, None) , ( protein: matrix metalloproteinase 9, None) 