病毒跟我们是一家人：科学家认为，十多亿年前一个大的DNA病毒在细菌细胞内居住并形成了第一个细胞核。
We are family: Scientists suspect that a large DNA-based virus took up residence inside a bacterial cell more than a billion years ago to create the first cell nucleus.
线粒体约含1 000种左右蛋白质，其中98%以上系由细胞核编码，在细胞质核糖体上以前体形式合成之后再运至线粒体并选分定位于各部分。
About 98% of the 1 000 or so mitochondrial proteins are encoded in the nucleus and synthesized on cytosolic ribosomes as precursors, which are then imported into mitochondria.
在HBV感染肝细胞以后，环状病毒基因组进入细胞核，并停留其中不受宿主细胞染色体的影响。
After infecting liver cells, the circular HBV genome travels to the cell nucleus, where it is remains, as a circle, independent from the cell chromosomes.
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