four viral proteins ( h , hemagglutination protein ; p , nucleocapsid-associated protein ; np , the major nucleocapsid protein ; and m , the matrix protein ) were readily detected in both cell lines by immune precipitation of [ ( 35 ) s ] methionine-labeled cell extracts followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis .
C0042736
viral proteins
C0033684
protein