[Proteins of the human parainfluenza virus].

Proteins of human parainfluenza type 3 virus propagated in green monkey kidney cultures are described. The presence of 4 major and 3 minor polypeptides is described along with their molecular weights. Protein F1 was found as a double band, its both components having a similar intensity. Only the upper band of F1 protein was found in the virus grown in Vero cell culture which has a low sensitivity for this virus. Fractionation of the virus and analysis of the proteins of subviral structures were carried out. Nucleocapsid had a buoyant density of 1.32 g/cm3 in cesium chloride and contained major NP protein and minor P and L proteins.