3017
In this study, serum from a patient with primary biliary cirrhosis was used to identify a cDNA encoding a novel component of the NB , a 140-kDa protein designated Sp140 .
 140-kDa protein, Sp140
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:
 140-kDa protein, Sp140