The embryos are created by injecting human stem cells in a varkensembryo, then 28 days in the uterus of a pig are placed.
The embryos with human cells can, in theory, be used to drugs to test, but also to bodies to cultivate for human patients, report researchers at the Salk Institute in San Diego in the scientific journal Cell.
The process of ‘human’ varkensembryo to grow was very difficult. The 2.075 embryos that were implanted in pigs, there were only 186 in life during the 28 days of the experiment. That is because humans and pigs are evolutionarily distant from each other sparingly.
In the embryos that remained alive, functioning human cells, however, as is apparent from the research. “It is the first time that human cells grow in the tissue of a large animal,” says lead researcher Juan Carlos Izpisua Belmonte on BBC News.
Medications
The cultured embryos exist only for 0.1 to 1 percent from human tissue. According to Izpisua Belmonte contain them with enough human cells to, for example, drugs to test, which also by people could be used. “Even after only 28 days in the uterus of a pig to grow, there are already billions of human cells in the embryos.”
The scientists are for the time being not going to live pigs to create human cells. In theory it would be possible to pigs to create human organs, which can then be harvested as donor organs, for example, human kidney disease.
That is an ethical point of view, however, is still not recognised, Izpisua Belmonte. “Not everything that is possible in science, you should run immediately. The society needs to decide how far we go.”
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