The scrapie agent in sheep may be similar to viroids.
绵羊的搔痒病因子可能也是类病毒。
Viroids can be widely spreaded by pruning, grafting and other agricultural operations.
它可以通过修剪、嫁接等农事操作进行广泛传播。
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。
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。
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