In the United States, scientists created sheep embryos with human cells. According to The Guardian, the experiment was carried out by the same group of scientists.
If in an experiment with pig embryos a single human cell accounted for 100 thousand pigs, then in this case one human cell on 10 thousand sheep cells.
Embryos developed for 28 days, of which 21 – in the uterus of the sheep. In order to allow the embryos to develop longer, additional regulatory approvals are needed.
Of course, the goal of the experiment is to create the functioning tissues and organs suitable for human transplantation. For this it is necessary that one percent of the of the embryo be human.