A long-held theory長期以來 is that women are born with all the eggs they will ever have. Researchers say they have shattered碎了 that idea by finding the stem cells幹細胞 which produce new eggs.
Doctors at Massachusetts General Hospital used unique獨特的 proteins on the surface表面 of stem cells to fish them out捕捉到 of ovarian卵巢 tissue組織.
The study, in Nature Medicine, showed that growing these cells in the laboratory resulted in new eggs being produced spontaneously自發. Legal and ethical合乎倫理的 rules limit research on human eggs, but the same techniques repeated on mice showed the eggs could be fertilised授精 and produce embryos胚胎.
The findings are a long way from being used in fertility生育 clinics but the researchers said the cells had unprecedented前所未有的 potential潛力 to overcome克服 infertility不孕. British experts said the study rewrote改寫 the rule book and opened up exciting new possibilities for women.
Doctors at Massachusetts General Hospital used unique獨特的 proteins on the surface表面 of stem cells to fish them out捕捉到 of ovarian卵巢 tissue組織.
The study, in Nature Medicine, showed that growing these cells in the laboratory resulted in new eggs being produced spontaneously自發. Legal and ethical合乎倫理的 rules limit research on human eggs, but the same techniques repeated on mice showed the eggs could be fertilised授精 and produce embryos胚胎.
The findings are a long way from being used in fertility生育 clinics but the researchers said the cells had unprecedented前所未有的 potential潛力 to overcome克服 infertility不孕. British experts said the study rewrote改寫 the rule book and opened up exciting new possibilities for women.
this text is from bbc learning english
http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/02/120228_witn_humaneggs.shtml
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