快猫短视频

AN AMERICAN biotech company last week confirmed reports that it is trying to
create cloned human embryos to extract embryonic stem cells from them.

But Advanced Cell Technology of Worcester, Massachusetts, will not say how
far it has got with its research. 鈥淪cientific results should be published in
scientific journals,鈥� says ACT鈥檚 chief executive, Michael West.

If the company has indeed managed to harvest stem cells from a cloned human
embryo, it has taken an important step towards therapeutic cloning. This is the
idea of growing perfectly matched tissue for transplant from stem cells taken
from a cloned embryo of the patient. Such embryos would be grown just long
enough harvest the stem cells.

Cloned human embryos have been created before. In 1998, a South Korean team
at Kyunghee University, Seoul, claimed they grew a cloned human embryo to the
four-cell stage before destroying it.

In Britain, since Parliament鈥檚 acceptance of the Donaldson report last year,
researchers are allowed to clone human embryos and grow them for up to 14 days
for research, though no one has reported doing this yet. But in the US, where
lawmakers are arguing over how best to draft legislation to regulate human
cloning, any research involving human embryos is highly controversial.

Researchers in the US who get any money or support from the government are
not allowed to do any work that involves destroying a human embryo, such as
taking stem cells. 快猫短视频s and patients鈥� groups want President Bush to relax
the rules, but he reportedly supports a bill that will ban human cloning even
for research purposes.