text: The sizes and characteristics of each of the proteins determined from various radiolabelling experiments allowed preliminary identification of the proteins as the large (L; 190 kDa), haemagglutinin neuraminidase (HN; 74 kDa), nucleocapsid (N; 66 kDa), fusion (F0; 63 kDa), phosphoprotein (P; 49 kDa), matrix (M; 43 kDa) and non-structural (V; 35 kDa) proteins.