New genes might exist in the strains with indeterminable gene types which expressed 1 to several crystal proteins with novel molecular weight. 分离菌株的基因类型较醋酸钠方法丰富，且相同基因型菌株的重复比例亦大大低于醋酸钠方法。
Because these viruses abortively infect human and most mammalian cells yet still effectivelypresent encoded forgein genes to the host immune system. 因为这类病毒不能感染人和大多数哺乳动物细胞，却可以有效地将外源基因编码的蛋白递呈给宿主免疫系统。
