The scrapie agent in sheep may be similar to viroids.
绵羊的因可类毒。
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Virologists are constantly looking for mutations that might make viruses such as influenza more likely to jump.
病毒学家一直在寻找可能令流感类病毒更易产生宿主。
They have no cytoplasmic membrane, cytosol, or functional organelles, but they can infect all types of cells and numerous viruses can also infect bacteria, which are called bacteriophages.
虽然没有细胞膜、细胞质和功能性细胞器，但它们可以感染所有类型细胞；许多病毒也能感染细菌，这类病毒也被称为噬菌体。
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因
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