3018
The predicted amino acid sequence of the amino-terminal portion of Sp140 was similar to Sp100 , a previously identified NB protein .
 ( protein: amino acid sequence, None) , ( protein: amino-terminal portion, None) , ( protein: NB protein, None) , ( protein: Sp100, None) , ( protein: Sp140, 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: amino acid sequence, None) , ( protein: amino-terminal portion, None) , ( protein: NB protein, None) , ( protein: Sp100, None) , ( protein: Sp140, None) 