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Human Fertilisation and Embryology Bill [HL]

My Lords, I should like to follow the remarks of my noble and learned friend Lord Mackay. Could the Minister give us, in short terms, a clear definition of what is a human admixed embryo and what is an animal admixed embryo? I do not like the expression of something being towards one end of a spectrum or towards the other end; I am interested to know where the spectrum changes. There must be a clear point. At the very least, the Minister should define it for the House, even if it cannot be included in a list of definitions in the Bill, although I think that perhaps it should be.