2645
Subunit 6 ( S6 ), an integral component of the 26S protease from human erythrocytes , has been studied by SDS-PAGE , peptide mapping and sequence analysis .
 ( cell type: human erythrocytes, None) , ( protein: 26S protease, None) , ( protein: S6, None) , ( protein: Subunit 6, 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:
 ( cell type: human erythrocytes, None) , ( protein: 26S protease, None) , ( protein: S6, None) , ( protein: Subunit 6, None) 