In 2007, the Human Fertilisation and Embryology Authority in London, UK, published "Hybrids and Chimeras: A Report on the Findings of the Consultation", which summarized a public debate about research on, and suggested policy for, human animal chimeras.
To educate its citizens about research into chimeras made from human and non-human animal cells, the United Kingdom's Human Fertilisation Embryology Authority published the consultation piece "Hybrids and Chimeras: A Consultation on the Ethical and Social Implications of Creating Human/Animal Embryos in Research," in 2007.
When cells—but not DNA—from two or more genetically distinct individuals combine to form a new individual, the result is called a chimera. Though chimeras occasionally occur in nature, scientists have produced chimeras in a laboratory setting since the 1960s.
In 1984 Sabine Meinecke-Tillmann and Burkhard Meinecke published their article “Experimental Chimeras — Removal of Reproductive Barrier Between Sheep and Goat” in Nature. Their study conquered the reproductive barrier between