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１９８９年，从山西省太谷县采集到的折带黄毒蛾核型多角体病毒（ＮＰＶ）材料经电镜观察，其多角体为三角形，四边形或不规则形。包涵体内的病毒粒子为双粒包埋类型。
In 1989, the virion NPV material collected from Taigu County, Shanxi Province was observed by electron microscopy and its polyhedron was triangular, quadrangular or irregular. The virus particles contained in the body is a double-particle embedded type.