Cells are the basic building blocks of all living things. The bulk of a human cell is made from cytoplasm and in the centre is the nucleus.
细胞是建造所有生命的基础的模块。这个人类细胞由细胞质组成，在细胞的中心是细胞核。
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The relationship between cytoplasm and nucleus is the basic problem of biology, and nuclear transfer (nt) and pronuclear transplantation are the important methods to research their relations.