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 .
 human erythrocytes, 26S protease, S6, Subunit 6
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:
 human erythrocytes, 26S protease, S6, Subunit 6