The embryos are called chimeras.
Scientists have grown partially-formed human kidneys inside pigthat were implanted in surrogate sows, an important step forward in growing human organs for transplant.
The team said that although similar methods have been used to generate human tissues such as blood or skeletal muscle, previous attempts to grow human organs in pigs have not succeeded. Integrating human stem cells into pig embryos has been a challenge because pig cells and human cells end up competing with each other.
Scientists have grown partially-formed human kidneys inside pig embryos that were implanted in surrogate sows
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