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Washington Post: For The First Time Scientists Create a Part-Human, Part-Pig Embryo

Washington Post: For The First Time Scientists Create a Part-Human, Part-Pig Embryo

Sarah Kaplan | The Washington Post -- 

For the first time, scientists have grown an embryo that is part-pig, part-human.

The experiment, described Thursday in the journal Cell, involves injecting human stem cells into the embryo of a pig, then implanting the embryo in the uterus of a sow and allowing it to grow. After four weeks, the stem cells had developed into the precursors of various tissue types, including heart, liver and neurons, and a small fraction of the developing pig was made up of human cells.

The human-pig hybrid — dubbed a “chimera” for the mythical creature with a lion's head, a goat's body and a serpent's tail — was “highly inefficient,” the researchers cautioned. But it's the most successful human-animal chimera and a significant step toward the development of animal embryos with functioning human organs.

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