(1)In this Act, except where otherwise stated—
(a)embryo means a live human embryo where fertilisation is complete, and
(b)references to an embryo include an egg in the process of fertilisation,
and, for this purpose, fertilisation is not complete until the appearance of a two cell zygote.
(2)This Act, so far as it governs bringing about the creation of an embryo, applies only to bringing about the creation of an embryo outside the human body; and in this Act—
(a)references to embryos the creation of which was brought about in vitro (in their application to those where fertilisation is complete) are to those where fertilisation began outside the human body whether or not it was completed there, and
(b)references to embryos taken from a woman do not include embryos whose creation was brought about in vitro.
(3)This Act, so far as it governs the keeping or use of an embryo, applies only to keeping or using an embryo outside the human body.
(4)References in this Act to gametes, eggs or sperm, except where otherwise stated, are to live human gametes, eggs or sperm but references below in this Act to gametes or eggs do not include eggs in the process of fertilisation.