Part human, part pig!

Sarah Kaplan reports at the Washingon 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.

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