To study the stem cell could explore the puzzle of human development, and could hope to produce the artificial organ as a replacement of the diseased one in the future.

研究干细胞可以探索人体发生发育之谜，更可望将来人工制造替代患病的组织器官。

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It is a long-held dream: an artificial heart to replace one that is damaged or diseased.

用人造心脏来替代病变或者损坏的心脏一直是医学界的一个梦想。

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In this way if one crop gets diseased, or one harvest succumbs to drought, or one hillside is flooded, they have alternatives to fall back on.

凭借这种方法，如果作物生了病，或者收成受到干旱的影响，或者遭遇山洪，他们都有替代的方法可供依靠。

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We counted the number of times we saw a copy of a gene in normal tissue and then in the diseased one, says David Searls, SmithKlines director of bioinformatics.

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Minute quantities of abnormal a-syn from older diseased mice exhibiting neurological symptoms were injected into one mouse group.

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"This chemical acts as the eyes and ears of the immune system, scouring the body for diseased cells, " said Heather Andrews, one of the researchers.

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