A Scottish team of animal biotechnologists announced this week they successfully introduced human stem cells into sheep embryos. Perhaps one day we will all have our very own baaing organ donors.
The team are currently allowed to let the chimeric embryos develop for 28 days, 21 of which are in the sheep. While that might be sufficient to see the development of the missing organ when human cells are eventually combined with the genetically modified embryo, Dr Hiro Nakauchi of Stanford University, who is part of the team, said a longer experiment, perhaps up to 70 days, would be more convincing, although that would require additional permission from institutional review boards.
But, Ross said, for the approach to work it is thought that about 1% of the embryo's cells would have to be human, meaning further work is needed to increase the proportion of human cells in the chimera.
Nakauchi also played down concerns: "The contribution of human cells so far is very small. It's nothing like a pig with a human face or human brain," he said
Who …. who said anything about… pigs with human faces and brains?