【科学60秒】细胞转化迈出新一步_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】细胞转化迈出新一步

听力简介：

One of the dreams of biomedical scientists is to be able to transform adult cells into other kinds of cells. And thus avoid some of ____1____ of working with ____2____ stem cells. Now a research team from McMaster University in Ontario has announced that they’ve been able to transform human skin cells into blood cells. The work was published online on November 7th by the journal Nature.
Other research in this area has required that cells of one type first be returned to a more generally ____3____ stem cell state, which can introduce fresh problems. Once there, the cell is then turned into the type of tissue the researchers seek. But in this case, the scientists avoided the middleman cell. The skin was changed directly into what appears to be functional adult human blood cells. The technique involves ____4____ by a virus vector and exposure to numerous regulatory proteins.
The cells have not been tested in humans to see if they’re truly ____5____ from the home-grown kind. But the research is another step in the effort to create needed cell types from easily available ones.
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