By SDS PAGE of whole bacterial proteins, LCB was proved to be deleted of one major protein subunits of 40 000 which exists only in pathogenic strains MG40.

• 全菌蛋白 SDS- PAGE电泳及免疫转印表明 ,该菌株缺失鸡致病性大肠埃希氏菌 MG4 0所特有的大小约为4 0 0 0 0的 1条多肽。