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Scientists have created the first hybrid embryo made from human cells and a cow's egg one month before MPs debate such research.

The work was carried out at Newcastle University, which was given a licence for the study by the Human Fertilisation and Embryology Authority (HFEA) in January.

The Newcastle team hope research on hybrid embryos will lead to a better understanding of how cells develop and new therapies for debilitating human conditions such as Parkinson's disease and stroke.

Hybrid embryos have to be destroyed within 14 days and they cannot be implanted in a woman.

Dr Lyle Armstrong, who is based at the International Centre for Life in Newcastle, presented the creation of the hybrid embryo as part of the team's preliminary findings from their research.

Professor John Burn, head of the Institute of Human Genetics at Newcastle University, said: "These are preliminary findings from on-going research.

"Once fully validated Dr Lyle Armstrong will be submitting the work for peer review and publication, as is normal procedure."

He added: "If the team can produce cells which will survive in culture it will open the door to a better understanding of disease processes without having to use precious human eggs.

"Cells grown using animal eggs cannot be used to treat patients on safety grounds but they will help bring nearer the day when new stem cell therapies are available."

Research on hybrid embryos has drawn impassioned debate, with the Archbishop of the Archdiocese of St Andrews and Edinburgh using his Easter address to warn about the ethical implications of such work.

He said research on hybrid embryos "attacks the sanctity and dignity of human life".

Last month the prime minister promised Labour MPs a free vote on the research, which is outlined in the human embryology and fertilisation bill currently before parliament.