1.类病毒
2.无壳病毒
3.预防菌苗
1.an infectious RNA particle that resembles a virus, but is smaller.
1.Until the structure of viroids was determined 25years ago, most believed that protein was also required.
25年前类病毒的结构被确认后,大多数科学家才相信蛋白质也是需要的。