The structural polypeptides of Mumps virus,Enders vaccineand M56-1 wild strains were analysed by SDS-polyacrylamide gel electro-phoresis. It was found that there was slight difference between the SDS-PAGE figures of their structural polypeptides.

• 腮腺炎病毒Enders疫苗株和M_(56-1)强毒株在鸡胚内繁殖和蔗糖密度梯度离心纯化后,经SDS-PAGE分析,表明两株病毒的SDS-PAGE图谱有差异。