Insert human ES cells into an animal embryo

The controversy over the legal regulation of human cloning was settled by the establishment of the law and the guidelines. However, the content of the regulation is very complicated and hard to understand, even for specialists. Below is a table showing the variation of regulations.

The only approved way of handling Specified Embryos is, at present, research on animal-human chimeric embryos, that is to say, research on an embryo produced by unification as a result of 1) inserting human somatic cells into an animal embryo, 2) inserting embryonic cells of a human fertilised embryo into an animal embryo, or 3) inserting embryonic cells of other Specified Embryos into an animal embryo. This means that the insertion of human ES cells into an animal embryo (in order to create transplantable organs) is considered to be approved in Japan. [8/9]

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The Ethics of Human Cloning and the Sprout of Human Life (2004)
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